Prosecution Insights
Last updated: April 19, 2026
Application No. 18/335,651

BACKPACK WORKING MACHINE

Final Rejection §103
Filed
Jun 15, 2023
Examiner
DANDRIDGE, CHRISTOPHER R.
Art Unit
3752
Tech Center
3700 — Mechanical Engineering & Manufacturing
Assignee
Makita Corporation
OA Round
2 (Final)
65%
Grant Probability
Favorable
3-4
OA Rounds
3y 7m
To Grant
99%
With Interview

Examiner Intelligence

Grants 65% — above average
65%
Career Allow Rate
375 granted / 575 resolved
-4.8% vs TC avg
Strong +38% interview lift
Without
With
+38.1%
Interview Lift
resolved cases with interview
Typical timeline
3y 7m
Avg Prosecution
58 currently pending
Career history
633
Total Applications
across all art units

Statute-Specific Performance

§101
0.5%
-39.5% vs TC avg
§103
47.6%
+7.6% vs TC avg
§102
25.9%
-14.1% vs TC avg
§112
20.8%
-19.2% vs TC avg
Black line = Tech Center average estimate • Based on career data from 575 resolved cases

Office Action

§103
DETAILED ACTION Claim Rejections - 35 USC § 103 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. Claim(s) 1-7 are rejected under 35 U.S.C. 103 as being unpatentable over Kamiya (WO 2014119130) in view of Minami (WO 2015087808). Regarding claim 1, Kamiya discloses a backpack working machine configured to eject liquid, the backpack working machine comprising: a body unit comprising a prime mover (20), a fan (21; dc motor has a fan), and a liquid tank (10) configured to store the liquid (The tank is capable of storing the liquid); a shoulder harness unit attached to the body unit and configured to be worn on shoulders of a user (Description, paragraph 3, shoulder belt); and an ejection tube (12) configured to eject the liquid (description paragraph 2) and being on a first side relative to the body unit when the shoulder harness unit is worn on the shoulders of the user (Figure 2, right side), but fails to disclose wherein the shoulder harness unit comprises: a right shoulder harness including a first harness attaching part mechanically a first attaching part of the body unit and configured to be worn on a right shoulder of the user; and a left shoulder harness including a second harness attaching part mechanically attached to a second attaching part of the body unit and configured to be worn on a left shoulder of the user. Minami discloses a sprayer that includes the shoulder harness unit comprises: a right shoulder harness including a first harness attaching part mechanically attached to a first attaching part of the body unit and configured to be worn on a right shoulder of the user; and a left shoulder harness including a second harness attaching part mechanically attached to a second attaching part of the body unit and configured to be worn on a left shoulder of the user (The hooks (18b) of the harness (18) are attached to the body unit at a left and right hook (the hooks of member 93) of the body unit, and are configured to be worn on a shoulder). Therefore, it would have been obvious to one having ordinary skill in the art before the effective filing date of the claimed invention to modify Kamiya with the disclosures of Minami, providing the shoulder harness unit to include a right shoulder harness (Kamiya, shoulder belt) including a first harness attaching part mechanically (Minami, hook 18b to hook member 93) attached to the body unit at a first attaching part of the body unit (Kamiya, 13) and configured to be worn on a right shoulder of the user (as modified); and a left shoulder harness including a second harness attaching part (Minami, hook 18b to hook member 93) mechanically attached to the body unit at a second attaching part of the body unit (Kamiya 13) and configured to be worn on a left shoulder of the user (Minami, The hooks (18b) of the harness (18) are attached to the body unit at a left and right hook (the hooks of member 93) of the body unit, and are configured to be worn on a shoulder), in order to provide for a known structure that ensures secure carrying of the backpack. Kamiya in view of Minami discloses a center position between the first attaching part and the second attaching part is on the first side relative to a gravity center position of the body unit when the liquid is stored in the liquid tank at a maximum capacity of the liquid tank (Lines 193-202, The center of gravity is optimized relative to the weight of the battery to be placed in the range E (Figure 2). The optimized point includes points that are to the left of the center position between the attaching parts). Should it be found that Kamiya in view of Minami fails to disclose a center position between the first attaching part and the second attaching part is on the first side relative to a gravity center position of the body unit when the liquid is stored in the liquid tank at a maximum capacity of the liquid tank, Kamiya discloses that the position of the center of gravity is within a range 0.2W to the left and right of the central axis of the sprayer, and optimized relative to the weight of the battery, in order to ensure that the user who carries the sprayer on his / her back will always carry the weight balance in the left / right width W direction (without tilting to the left or right) regardless of the amount of spray liquid in the storage tank. The position of the center of gravity relative to the central axis is put forth as a result-effective variable, as changing of the position will change the ability of the user to carry the pack in a desired orientation. Further, it appears that one of ordinary skill in the art would have had a reasonable expectation of success in modifying the Kamiya in view of Minami device to feature the points to the left of the center between the harnesses, as it involves only adjusting the position of the center relative to central axis, which is disclosed as a component to require adjustment. Therefore, it would have been obvious to one having ordinary skill in the art before the effective filing date of the claimed invention to modify the device of Kamiya in view of Minami by providing the center of gravity to be within the range of points disclosed as being to the left of the central axis, and less than a distance of .2W, since it has been held that “where the general conditions of a claim are disclosed in the prior art, it is not inventive to discover the optimum or workable ranges by routine experimentation." In re Aller, 220 F.2d 454, 456, 105 USPQ 233, 235 (CCPA 1955). Regarding claim 2, Kamiya in view of Minami discloses the backpack working machine according to claim 1, wherein a gravity center position of the backpack working machine when the liquid is stored in the liquid tank at the maximum capacity of the liquid tank is at a first gravity center position, the first gravity center position is on a second side relative to the center position, the second side being opposite the first side (as modified), a gravity center position of the backpack working machine when the liquid is not stored in the liquid tank is at a second gravity center position, and the second gravity center position is on the first side relative to the center position (As modified, the center of gravity will move to the second side (first side relative to the center, at 0.2W, when the liquid is not stored in the tank). Regarding claim 3, Kamiya in view of Minami discloses the backpack working machine according to claim 2, wherein a distance from the center position to the first gravity center position in a left-right direction is same as a distance from the center position to the second gravity center position in the left-right direction (The distance relative distance extends 0.2W on each side). Regarding claim 4, Kamiya in view of Minami discloses the backpack working machine according to claim 1, wherein the first attaching part and the second attaching part are disposed on the liquid tank (Kamiya, Figure 12). Regarding claim 5, Kamiya in view of Minami discloses the backpack working machine according to claim 1, wherein the fan is configured to deliver air to the ejection tube by operation of the prime mover, and the liquid is ejected from the ejection tube with the air delivered by the fan (The fan works as a part of the prime mover, and is capable of performing the claimed function). Regarding claim 6, Kamiya in view of Minami discloses the backpack working machine according to claim 3, wherein the first attaching part and the second attaching part are disposed on the liquid tank (See claim 4), the fan is configured to deliver air to the ejection tube by operation of the prime mover, and the liquid is ejected from the ejection tube with the air delivered by the fan (See claim 5). Regarding claim 7, Kamiya in view of Minami discloses the backpack working machine according to claim 1, wherein the gravity center position of the body unit when the liquid is stored in the liquid tank at the maximum capacity of the liquid tank is on the first side relative to a center position of the body unit in a left-right direction, the gravity center position of the body unit when the liquid is not stored in the liquid tank is on the first side relative to the center position of the body unit in the left-right direction, and the center position between the first attaching part and the second attaching part is on the first side relative to the center position of the body unit in the left-right direction (As modified, the gravity center position and center position between the attaching parts are optimized to be in the claimed position). Response to Arguments Applicant’s arguments with respect to claim(s) 1 have been considered but are moot because the new ground of rejection does not rely on any reference applied in the prior rejection of record for any teaching or matter specifically challenged in the argument. Conclusion THIS ACTION IS MADE FINAL. Applicant is reminded of the extension of time policy as set forth in 37 CFR 1.136(a). A shortened statutory period for reply to this final action is set to expire THREE MONTHS from the mailing date of this action. In the event a first reply is filed within TWO MONTHS of the mailing date of this final action and the advisory action is not mailed until after the end of the THREE-MONTH shortened statutory period, then the shortened statutory period will expire on the date the advisory action is mailed, and any nonprovisional extension fee (37 CFR 1.17(a)) pursuant to 37 CFR 1.136(a) will be calculated from the mailing date of the advisory action. In no event, however, will the statutory period for reply expire later than SIX MONTHS from the mailing date of this final action. Any inquiry concerning this communication or earlier communications from the examiner should be directed to CHRISTOPHER R. DANDRIDGE whose telephone number is (571)270-1505. The examiner can normally be reached M-T 9am-7pm. 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, Arthur O. Hall can be reached at (571)270-1814. 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. CHRISTOPHER R. DANDRIDGE Primary Examiner Art Unit 3752 /CHRISTOPHER R DANDRIDGE/Primary Examiner, Art Unit 3752
Read full office action

Prosecution Timeline

Jun 15, 2023
Application Filed
Jun 07, 2025
Non-Final Rejection — §103
Jul 11, 2025
Interview Requested
Jul 23, 2025
Applicant Interview (Telephonic)
Jul 23, 2025
Examiner Interview Summary
Jul 31, 2025
Response Filed
Sep 29, 2025
Final Rejection — §103 (current)

Precedent Cases

Applications granted by this same examiner with similar technology

Patent 12599924
ATOMIZATION BOTTLE AND LIQUID ATOMIZATION DEVICE INCLUDING THE ATOMIZATION BOTTLE
2y 5m to grant Granted Apr 14, 2026
Patent 12599793
COOPERATIVE FIRE EXTINGUISHING SYSTEM FOR VEHICLE
2y 5m to grant Granted Apr 14, 2026
Patent 12594445
ADDRESSING OPTICAL FIRING CARTRIDGE USING CHROMATIC ABERRATION
2y 5m to grant Granted Apr 07, 2026
Patent 12594444
Mobile Fire-Fighting Assembly
2y 5m to grant Granted Apr 07, 2026
Patent 12582855
INTEGRATED AIR DISTRIBUTION SYSTEM AND FIRE SUPPRESSION SYSTEM
2y 5m to grant Granted Mar 24, 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

3-4
Expected OA Rounds
65%
Grant Probability
99%
With Interview (+38.1%)
3y 7m
Median Time to Grant
Moderate
PTA Risk
Based on 575 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