Prosecution Insights
Last updated: April 18, 2026
Application No. 18/748,048

SYSTEMS AND METHODS FOR ADJUSTING A STIFFNESS OF FITNESS MACHINES

Non-Final OA §102§103§112
Filed
Jun 19, 2024
Examiner
NGUYEN, NYCA T
Art Unit
3784
Tech Center
3700 — Mechanical Engineering & Manufacturing
Assignee
Life Fitness LLC
OA Round
1 (Non-Final)
67%
Grant Probability
Favorable
1-2
OA Rounds
2y 7m
To Grant
93%
With Interview

Examiner Intelligence

Grants 67% — above average
67%
Career Allow Rate
454 granted / 676 resolved
-2.8% vs TC avg
Strong +25% interview lift
Without
With
+25.4%
Interview Lift
resolved cases with interview
Typical timeline
2y 7m
Avg Prosecution
28 currently pending
Career history
704
Total Applications
across all art units

Statute-Specific Performance

§101
2.4%
-37.6% vs TC avg
§103
34.8%
-5.2% vs TC avg
§102
28.5%
-11.5% vs TC avg
§112
30.1%
-9.9% vs TC avg
Black line = Tech Center average estimate • Based on career data from 676 resolved cases

Office Action

§102 §103 §112
Notice of Pre-AIA or AIA Status The present application, filed on or after March 16, 2013, is being examined under the first inventor to file provisions of the AIA . Claim Rejections - 35 USC § 112 The following is a quotation of 35 U.S.C. 112(b): (b) CONCLUSION.—The specification shall conclude with one or more claims particularly pointing out and distinctly claiming the subject matter which the inventor or a joint inventor regards as the invention. The following is a quotation of 35 U.S.C. 112 (pre-AIA ), second paragraph: The specification shall conclude with one or more claims particularly pointing out and distinctly claiming the subject matter which the applicant regards as his invention. Claims 1-20 are rejected under 35 U.S.C. 112(b) or 35 U.S.C. 112 (pre-AIA ), second paragraph, as being indefinite for failing to particularly point out and distinctly claim the subject matter which the inventor or a joint inventor (or for applications subject to pre-AIA 35 U.S.C. 112, the applicant), regards as the invention. Claims 1, 14, 19, and 20 recite “may extend”, it is unclear if the limitation thereafter is required. In order to proceed, the Office will interpret the claim such as --is configured to extend--. Claim Rejections - 35 USC § 102 In the event the determination of the status of the application as subject to AIA 35 U.S.C. 102 and 103 (or as subject to pre-AIA 35 U.S.C. 102 and 103) is incorrect, any correction of the statutory basis (i.e., changing from AIA to pre-AIA ) for the rejection will not be considered a new ground of rejection if the prior art relied upon, and the rationale supporting the rejection, would be the same under either status. The following is a quotation of the appropriate paragraphs of 35 U.S.C. 102 that form the basis for the rejections under this section made in this Office action: A person shall be entitled to a patent unless – (a)(1) the claimed invention was patented, described in a printed publication, or in public use, on sale, or otherwise available to the public before the effective filing date of the claimed invention. (a)(2) the claimed invention was described in a patent issued under section 151, or in an application for patent published or deemed published under section 122(b), in which the patent or application, as the case may be, names another inventor and was effectively filed before the effective filing date of the claimed invention. Claim(s) 1, 3-12, 14-18, and 20 is/are rejected under 35 U.S.C. 102(a)(1) as being anticipated by Wang (US 20080176718 A1). Regarding Claim 1, Wang teaches a system for adjusting a stiffness of a fitness machine operable by a user, the fitness machine having a base 12 and a mobile portion 20,25 that moves relative to the base 12 during operation of the fitness machine, the system comprising: a resilient body 40 that resists movement of the mobile portion 20,25 towards the base 12 in a height direction, wherein the resilient body has a length defined in a length direction that is perpendicular to the height direction, and wherein the length of the resilient body increases when the mobile portion moves towards the base 12 (Refer to Figs. 2&3 Paragraph [0019]:”A pair of -shaped rigid connection elements 30 and a pair of pivotal rigid cushioning elements 40 are interposed between the bottom surface of both sides of the platform frame 20 and the base bars 12. The pivotal rigid cushioning element 40 includes a guidewheel 41 at one end thereof. In this way, the guidewheel 41 is movable on the surface of the base bar 12 when the platform frame 20 is moved up and down by the external forces applied to it (see FIG. 3 & FIG. 5). Accordingly, the cushioning and restoring effects can be achieved.”); and PNG media_image1.png 534 516 media_image1.png Greyscale an actuator 42 operable to adjust a set maximum for which the length of the resilient body may extend during operation of the fitness machine (Refer to Figs. 4&5 Paragraph [0020] Moreover, a resistance-adjusting element 42 is provided at the bottom of the guidewheel 41. A free adjustment of the cushioning force may be achieved by the inclination of the resistance-adjusting element 42. An auxiliary supporting element 50 is pivotally interposed between both sides of the platform frame 20 and the handle frame assembly 10, respectively. As a result, a complete cushioning and restoring effect can be ensured….[0021] In a few words, the sliding resistance created by the resistance adjusting element 42 and acting on the guidewheel 41 is smaller when the inclination of the resistance adjusting element 42 approaches to the horizontal position, as shown in FIGS. 2 and 3. To the contrary, the sliding resistance acting on the guidewheel 41 will be increased, as shown in FIGS. 4 and 5.”..The set maximum for which the length of the resilient body 40 may extend is less when the actuator is at an angle and extended in Fig. 5 than when the actuator is not extended in Fig. 3), wherein a resistance provided by the resilient body to resist movement of the mobile portion towards the base is unaffected by operation of the actuator when the length of the resilient body is less than the set maximum (The Office takes the position that the resistance is unaffected by operation of the actuator when the length of the resilient body 40 is less than the set maximum until end 41 of the resilient body 40 hits the end wall (the set maximum) and provides a resistance force upwards against the mobile portion in the same manner as Applicants invention). PNG media_image2.png 566 476 media_image2.png Greyscale Regarding Claim 3-5, Wang teaches the claimed invention as noted above, wherein Wang teaches an embodiment comprising two resilient members 40 which form a parabolic shape comprising a non-translatable end and a movable end (Refer to annotated Fig. 7), and wherein the mobile portion 20,25 is supported at least in part by a vertex (top) of the parabolic shape of the resilient body 40 (Refer to annotated Fig. 7 below). PNG media_image3.png 410 624 media_image3.png Greyscale Regarding Claim 6, Wang continues to teach wherein a second end 41 of the resilient body 40 is translatable relative to the base 12 in the length direction and non-translatable in the height direction (Refer to Figs. 3,4,&7 where the actuator is not extended and the second end 41 of the resilient body 40 slides lengthwise but not change height). Regarding Claim 7, Wang continues to teach wherein operating the actuator 42 causes the actuator to linearly extend (Refer to Figs. 3&4). Regarding Claim 8, Wang continues to teach wherein the actuator 42 and the resilient body 40 are pivotally coupled together (Refer to Paragraph [0019]:” The pivotal rigid cushioning element 40 includes a guidewheel 41 at one end thereof. In this way, the guidewheel 41 is movable on the surface of the base bar 12 when the platform frame 20 is moved up and down by the external forces applied to it (see FIG. 3 & FIG. 5). Accordingly, the cushioning and restoring effects can be achieved.”..The Office takes the position that the resilient body 40 is pivotally moveable on a track that is connected to the actuator 42 (Refer to annotated Fig. 7 below)). PNG media_image4.png 378 668 media_image4.png Greyscale Regarding Claim 9, Wang continues to teach wherein the mobile portion is moveable towards the base in a first phase and in a second phase, wherein in the first phase the mobile portion moves towards the base principally via bending of the resilient body 40 (Refer to Fig. 4 to depict that the top of the resilient body 40 is bent), and wherein in the second phase the mobile portion moves towards the base principally via compression of the resilient body (Refer to Fig. 5 to depict that the resilient body is compressed once the second end hits the end wall to stop the resilient body 40 for extending further lengthwise). PNG media_image5.png 468 808 media_image5.png Greyscale Regarding Claim 10, Wang continues to teach wherein the fitness machine is a treadmill and the mobile portion 20 is a running deck supporting a belt 25 on which the user runs (Refer to Fig. 1). Regarding Claim 11, Wang continues to teach wherein the resilient body is a first resilient body 40, further comprising at least one additional resilient body 40 functionally equivalent to the first resilient body, and wherein the first resilient body and the at least one additional resilient body both resist the movement of the mobile portion towards the base in the height direction (Refer to Fig. 6 Paragraph [0023] Referring to FIG. 6, which is a schematic drawing of another preferred embodiment of the invention, the pivotal rigid cushioning element 40, may be made of a plurality of arched steel plates for increasing the whole strength. Likewise, the pivotal rigid cushioning elements 40 may be symmetrically designed in .andgate.-form for enhancing the whole effect thereof.”). Regarding Claim 12, Wang continues to teach wherein the actuator is operable to adjust the set maximums for both the first resilient body 40 and the at least one additional resilient body 40 (Refer to Paragraph [0021]:”In a few words, the sliding resistance created by the resistance adjusting element 42 and acting on the guidewheel 41 is smaller when the inclination of the resistance adjusting element 42 approaches to the horizontal position, as shown in FIGS. 2 and 3. To the contrary, the sliding resistance acting on the guidewheel 41 will be increased, as shown in FIGS. 4 and 5.”). Regarding Claim 14, Wang teaches a method for adjusting a stiffness of a fitness machine operable by a user, the fitness machine having a base 12 and a mobile portion 20,25 that moves relative to the base 12 during operation of the fitness machine, the method comprising: resisting via a resilient body 40 movement of the mobile portion 20,25 towards the base 12 in a height direction, wherein the resilient body has a length defined in a length direction that is perpendicular to the height direction, and wherein the length of the resilient body increases when the mobile portion moves towards the base 12 (Refer to Figs. 2&3 Paragraph [0019]:”A pair of -shaped rigid connection elements 30 and a pair of pivotal rigid cushioning elements 40 are interposed between the bottom surface of both sides of the platform frame 20 and the base bars 12. The pivotal rigid cushioning element 40 includes a guidewheel 41 at one end thereof. In this way, the guidewheel 41 is movable on the surface of the base bar 12 when the platform frame 20 is moved up and down by the external forces applied to it (see FIG. 3 & FIG. 5). Accordingly, the cushioning and restoring effects can be achieved.”); and PNG media_image1.png 534 516 media_image1.png Greyscale operating an actuator 42 to adjust a set maximum for which the length of the resilient body may extend during operation of the fitness machine (Refer to Figs. 4&5 Paragraph [0020] Moreover, a resistance-adjusting element 42 is provided at the bottom of the guidewheel 41. A free adjustment of the cushioning force may be achieved by the inclination of the resistance-adjusting element 42. An auxiliary supporting element 50 is pivotally interposed between both sides of the platform frame 20 and the handle frame assembly 10, respectively. As a result, a complete cushioning and restoring effect can be ensured….[0021] In a few words, the sliding resistance created by the resistance adjusting element 42 and acting on the guidewheel 41 is smaller when the inclination of the resistance adjusting element 42 approaches to the horizontal position, as shown in FIGS. 2 and 3. To the contrary, the sliding resistance acting on the guidewheel 41 will be increased, as shown in FIGS. 4 and 5.”..The set maximum for which the length of the resilient body 40 may extend is less when the actuator is at an angle and extended in Fig. 5 than when the actuator is not extended in Fig. 3), wherein a resistance provided by the resilient body to resist movement of the mobile portion towards the base is unaffected by operating the actuator when the length of the resilient body is less than the set maximum (The Office takes the position that the resistance is unaffected by operation of the actuator when the length of the resilient body 40 is less than the set maximum until end 41 of the resilient body 40 hits the end wall (the set maximum) and provides a resistance force upwards against the mobile portion in the same manner as Applicants invention). PNG media_image2.png 566 476 media_image2.png Greyscale Regarding Claim 15, Wang continues to teach wherein the resilient body 40 is a first resilient body, further comprising also resisting the movement of the mobile portion towards the base in the height direction via a second resilient body 40 (Refer to Fig. 6 Paragraph [0023] Referring to FIG. 6, which is a schematic drawing of another preferred embodiment of the invention, the pivotal rigid cushioning element 40, may be made of a plurality of arched steel plates for increasing the whole strength. Likewise, the pivotal rigid cushioning elements 40 may be symmetrically designed in .andgate.-form for enhancing the whole effect thereof.”). Regarding Claim 16, Wang continues to teach wherein operating the actuator adjusts the set maximums of the lengths of the first resilient body and the second body at the same time (Refer to Fig. Paragraph [0021]:”In a few words, the sliding resistance created by the resistance adjusting element 42 and acting on the guidewheel 41 is smaller when the inclination of the resistance adjusting element 42 approaches to the horizontal position, as shown in FIGS. 2 and 3. To the contrary, the sliding resistance acting on the guidewheel 41 will be increased, as shown in FIGS. 4 and 5.”). Regarding Claim 17, Wang continues to teach wherein operating the actuator 42 causes the actuator to linearly extend (Refer to Figs. 3&4). Regarding Claim 18, Wang continues to teach wherein the mobile portion is moveable towards the base in a first phase and in a second phase, wherein in the first phase the mobile portion moves towards the base principally via bending of the resilient body 40 (Refer to Fig. 4 to depict that the top of the resilient body 40 is bent), and wherein in the second phase the mobile portion moves towards the base principally via compression of the resilient body (Refer to Fig. 5 to depict that the resilient body is compressed once the second end hits the end wall to stop the resilient body 40 for extending further lengthwise). PNG media_image5.png 468 808 media_image5.png Greyscale Regarding Claim 20, Wang teaches a method for adjusting a stiffness of a fitness machine operable by a user, the fitness machine having a base 12 and a mobile portion 20,25 that moves relative to the base 12 during operation of the fitness machine, the method comprising: resisting via a resilient body 40 movement of the mobile portion 20,25 towards the base 12 in a height direction, wherein the resilient body has a length defined in a length direction that is perpendicular to the height direction, and wherein the length of the resilient body increases when the mobile portion moves towards the base 12 (Refer to Figs. 2&3 Paragraph [0019]:”A pair of -shaped rigid connection elements 30 and a pair of pivotal rigid cushioning elements 40 are interposed between the bottom surface of both sides of the platform frame 20 and the base bars 12. The pivotal rigid cushioning element 40 includes a guidewheel 41 at one end thereof. In this way, the guidewheel 41 is movable on the surface of the base bar 12 when the platform frame 20 is moved up and down by the external forces applied to it (see FIG. 3 & FIG. 5). Accordingly, the cushioning and restoring effects can be achieved.”); and PNG media_image1.png 534 516 media_image1.png Greyscale operating an actuator 42 to adjust a set maximum for which the length of the resilient body may extend during operation of the fitness machine (Refer to Figs. 4&5 Paragraph [0020] Moreover, a resistance-adjusting element 42 is provided at the bottom of the guidewheel 41. A free adjustment of the cushioning force may be achieved by the inclination of the resistance-adjusting element 42. An auxiliary supporting element 50 is pivotally interposed between both sides of the platform frame 20 and the handle frame assembly 10, respectively. As a result, a complete cushioning and restoring effect can be ensured….[0021] In a few words, the sliding resistance created by the resistance adjusting element 42 and acting on the guidewheel 41 is smaller when the inclination of the resistance adjusting element 42 approaches to the horizontal position, as shown in FIGS. 2 and 3. To the contrary, the sliding resistance acting on the guidewheel 41 will be increased, as shown in FIGS. 4 and 5.”..The set maximum for which the length of the resilient body 40 may extend is less when the actuator is at an angle and extended in Fig. 5 than when the actuator is not extended in Fig. 3), wherein a resistance provided by the resilient body to resist movement of the mobile portion towards the base is unaffected by operating the actuator when the length of the resilient body is less than the set maximum (The Office takes the position that the resistance is unaffected by operation of the actuator when the length of the resilient body 40 is less than the set maximum until end 41 of the resilient body 40 hits the end wall (the set maximum) and provides a resistance force upwards against the mobile portion in the same manner as Applicants invention). PNG media_image2.png 566 476 media_image2.png Greyscale Claim Rejections - 35 USC § 103 In the event the determination of the status of the application as subject to AIA 35 U.S.C. 102 and 103 (or as subject to pre-AIA 35 U.S.C. 102 and 103) is incorrect, any correction of the statutory basis (i.e., changing from AIA to pre-AIA ) for the rejection will not be considered a new ground of rejection if the prior art relied upon, and the rationale supporting the rejection, would be the same under either status. The following is a quotation of 35 U.S.C. 103 which forms the basis for all obviousness rejections set forth in this Office action: A patent for a claimed invention may not be obtained, notwithstanding that the claimed invention is not identically disclosed as set forth in section 102, if the differences between the claimed invention and the prior art are such that the claimed invention as a whole would have been obvious before the effective filing date of the claimed invention to a person having ordinary skill in the art to which the claimed invention pertains. Patentability shall not be negated by the manner in which the invention was made. The factual inquiries for establishing a background for determining obviousness under 35 U.S.C. 103 are summarized as follows: 1. Determining the scope and contents of the prior art. 2. Ascertaining the differences between the prior art and the claims at issue. 3. Resolving the level of ordinary skill in the pertinent art. 4. Considering objective evidence present in the application indicating obviousness or nonobviousness. Claim 2 is/are rejected under 35 U.S.C. 103 as being unpatentable over Wang (US 20080176718) in view of Molter et al (US 20070015636). Regarding Claim 2, Wang teaches the claimed invention as noted above but fails to teach wherein the resilient body 40 is an elastomer. Molter et al teaches a treadmill cushion element 50-56 comprising an elastomeric material (Refer to Fig. 3 Paragraph [0027]:” Normally, the term leaf spring relates to long narrow springs consisting of several layers of metal springs bracketed together. However, here this term will include an elongated, arc shaped spring made of an elastic or elastomeric material.”). Molter et al is from the same field of endeavor as Applicants invention and therefore it would have been obvious to modify the resilient body 40 of Wang to be an elastomer since Molter et al teaches that such material is known to be suitable in the art for cushioning a running deck and does not patentably distinguish the invention over prior arts. Allowable Subject Matter Claim 13 is objected to as being dependent upon a rejected base claim, but would be allowable if rewritten in independent form including all of the limitations of the base claim and any intervening claims. Claim 19 would be allowable if rewritten to overcome the rejection(s) under 35 U.S.C. 112(b) or 35 U.S.C. 112 (pre-AIA ), 2nd paragraph, set forth in this Office action and to include all of the limitations of the base claim and any intervening claims. The following is an examiner’s statement of reasons for allowance: Wang is the closest prior art to the claimed invention teaching a system for adjusting a stiffness of a fitness machine operable by a user, the fitness machine having a base and a mobile portion that moves relative to the base during operation of the fitness machine, the system comprising: a resilient body that resists movement of the mobile portion towards the base in a height direction, wherein the resilient body has a length defined in a length direction that is perpendicular to the height direction, and wherein the length of the resilient body increases when the mobile portion moves towards the base; and an actuator operable to adjust a set maximum for which the length of the resilient body may extend during operation of the fitness machine, wherein a resistance provided by the resilient body to resist movement of the mobile portion towards the base is unaffected by operation of the actuator when the length of the resilient body is less than the set maximum and wherein the resilient body is a first resilient body, further comprising at least one additional resilient body functionally equivalent to the first resilient body, and wherein the first resilient body and the at least one additional resilient body both resist the movement of the mobile portion towards the base in the height direction but fails to teach the claim invention as a whole further comprising wherein the set maximum for the first resilient body is adjustable separately than the set maximum for the at least one additional resilient body and/or wherein the actuator is a first actuator and the resilient body is a first resilient body, further comprising also resisting the movement of the mobile portion towards the base in the height direction via a second resilient body, further comprising operating a second actuator to adjust a set maximum for which the length of the second resilient body may extend during operation of the fitness machine, wherein a resistance provided by the second resilient body to resist movement of the mobile portion towards the base is unaffected by operating the second actuator when the length of the second resilient body is less than the set maximum. Any comments considered necessary by applicant must be submitted no later than the payment of the issue fee and, to avoid processing delays, should preferably accompany the issue fee. Such submissions should be clearly labeled “Comments on Statement of Reasons for Allowance.” Conclusion The prior art made of record and not relied upon is considered pertinent to applicant's disclosure. Refer to attach list of references cited pertinent to claimed and unclaimed subject matter. Any inquiry concerning this communication or earlier communications from the examiner should be directed to NYCA T NGUYEN whose telephone number is (571)272-7168. The examiner can normally be reached Mon-Fri 9:00-5:00. Examiner interviews are available via telephone, in-person, and video conferencing using a USPTO supplied web-based collaboration tool. To schedule an interview, applicant is encouraged to use the USPTO Automated Interview Request (AIR) at http://www.uspto.gov/interviewpractice. If attempts to reach the examiner by telephone are unsuccessful, the examiner’s supervisor, Loan Jimenez can be reached at 571-272-4966. The fax phone number for the organization where this application or proceeding is assigned is 571-273-8300. Information regarding the status of published or unpublished applications may be obtained from Patent Center. Unpublished application information in Patent Center is available to registered users. To file and manage patent submissions in Patent Center, visit: https://patentcenter.uspto.gov. Visit https://www.uspto.gov/patents/apply/patent-center for more information about Patent Center and https://www.uspto.gov/patents/docx for information about filing in DOCX format. For additional questions, contact the Electronic Business Center (EBC) at 866-217-9197 (toll-free). If you would like assistance from a USPTO Customer Service Representative, call 800-786-9199 (IN USA OR CANADA) or 571-272-1000. /NYCA T NGUYEN/ Primary Examiner, Art Unit 3784
Read full office action

Prosecution Timeline

Jun 19, 2024
Application Filed
Dec 12, 2025
Non-Final Rejection — §102, §103, §112
Mar 26, 2026
Response Filed

Precedent Cases

Applications granted by this same examiner with similar technology

Patent 12594455
ELASTIC SUPPORT DEVICE AND OPTIONAL POWER SHIRT AND METHOD OF USE THEREOF
2y 5m to grant Granted Apr 07, 2026
Patent 12589275
Multifunctional and Adjustable Resistance Training Device
2y 5m to grant Granted Mar 31, 2026
Patent 12576312
Device for training human's motor skills and in particular the adaptation to instability, the strength and mobility
2y 5m to grant Granted Mar 17, 2026
Patent 12576298
FITNESS SYSTEM, FITNESS ASSEMBLY ARRANGEMENT AND FUNCTIONAL FITNESS ELEMENTS
2y 5m to grant Granted Mar 17, 2026
Patent 12569709
DUAL MOTOR EXERCISE MACHINE
2y 5m to grant Granted Mar 10, 2026
Study what changed to get past this examiner. Based on 5 most recent grants.

AI Strategy Recommendation

Get an AI-powered prosecution strategy using examiner precedents, rejection analysis, and claim mapping.
Powered by AI — typically takes 5-10 seconds

Prosecution Projections

1-2
Expected OA Rounds
67%
Grant Probability
93%
With Interview (+25.4%)
2y 7m
Median Time to Grant
Low
PTA Risk
Based on 676 resolved cases by this examiner. Grant probability derived from career allow rate.

Sign in with your work email

Enter your email to receive a magic link. No password needed.

Personal email addresses (Gmail, Yahoo, etc.) are not accepted.

Free tier: 3 strategy analyses per month