Prosecution Insights
Last updated: April 18, 2026
Application No. 18/668,581

ROLLATOR

Non-Final OA §102§103
Filed
May 20, 2024
Examiner
HAWK, NOAH CHANDLER
Art Unit
3636
Tech Center
3600 — Transportation & Electronic Commerce
Assignee
Zijie Liu
OA Round
1 (Non-Final)
62%
Grant Probability
Moderate
1-2
OA Rounds
2y 0m
To Grant
84%
With Interview

Examiner Intelligence

Grants 62% of resolved cases
62%
Career Allow Rate
950 granted / 1545 resolved
+9.5% vs TC avg
Strong +22% interview lift
Without
With
+22.0%
Interview Lift
resolved cases with interview
Fast prosecutor
2y 0m
Avg Prosecution
62 currently pending
Career history
1607
Total Applications
across all art units

Statute-Specific Performance

§101
0.1%
-39.9% vs TC avg
§103
41.2%
+1.2% vs TC avg
§102
34.7%
-5.3% vs TC avg
§112
22.1%
-17.9% vs TC avg
Black line = Tech Center average estimate • Based on career data from 1545 resolved cases

Office Action

§102 §103
DETAILED ACTION 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 § 102 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. Claims 1-2 are rejected under 35 U.S.C. 102(a)(1) as being anticipated by Howle in US Patent 6311708. Regarding Claim 1, Howle teaches a rollator, comprising: a front wheel bracket (6/8); a rear wheel bracket (12/14); at least one seat assembly (2), configured for a user to ride on; and a connection mechanism (22/26/32) connected between the front wheel bracket and rear wheel bracket, configured for the seat assembly to be detachably connected; wherein the seat assembly is capable of flipping around the connection mechanism to drive the front wheel bracket to move towards the rear wheel bracket and be folded onto the rear wheel bracket (Fig. 5); the connection mechanism comprises a first connection rod (22), a second connection rod (26), and an installation plate (32); the first connection rod is hinged on the front wheel bracket (at 24); one end of the second connection rod is hinged on the rear wheel bracket (at 24) and the other end thereof is hinged on the first connection rod (at 28); the installation plate is provided on the first connection rod and configured to connect the seat assembly; the first connection rod is driven to flip forward around the front wheel bracket by the seat assembly, and the second connection rod is driven to reverse backward to fold the front wheel bracket onto the rear wheel bracket by the seat assembly, the first connection rod abuts against the rear wheel bracket after being folded (Fig. 5). Regarding Claim 2, Howle teaches (see Fig. 4) that a length of the first connection rod is longer than a length of the second connection rod. 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 3 is rejected under 35 U.S.C. 103 as being unpatentable over Howle, as applied to Claim 1 above in view of VanAusdall in US Patent 10292893. Howle teaches a first roller (36) is attached to the rear wheel frame body, but is silent on the use of a hinge to mount the roller. VanAusdall teaches a rollator including a rear wheel bracket (110) comprising a rear wheel frame body (150), a first roller (118) hinged (at 116) on the rear wheel frame body, a connection kit (126/194) sleeved on the rear wheel frame body and configured for a front wheel bracket (136) to be hinged and a handlebar assembly (218) configured to be inserted forward (Fig. 11) or backward (Fig. 8) on the connection kit. It would have been obvious to one of ordinary skill in the art before the effective filing date of the claimed invention to modify the device of Howle by using a hinged roller and reversible handlebar as taught by VanAusdall in order to allow the device to fold more compactly and allow the user to use the device from either side. Claim 8 is rejected under 35 U.S.C. 103 as being unpatentable over Howle as applied to Claim 1 above in view of Willis in US Publication 2008/0111349. Howle is silent on the use of a foot pedal. Willis teaches a front wheel bracket (308’) provided with a foot pedal (342) configured for the user to step on. It would have been obvious to one of ordinary skill in the art before the effective filing date of the claimed invention to modify the device of Howle by adding a foot pedal to the front wheel bracket as taught by Willis in order to allow the user to rest their feet off the ground. Allowable Subject Matter Claims 4-7, 9, and 10 are 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. Conclusion The prior art made of record and not relied upon is considered pertinent to applicant's disclosure. Robb, Owens, Bradshaw et al., Che, Fellingham et al., Wu, Morris et al., and Andersen teach rollators. Any inquiry concerning this communication or earlier communications from the examiner should be directed to NOAH C. HAWK whose telephone number is (571)272-1480. The examiner can normally be reached M-F 9am to 5:30pm. 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, David Dunn can be reached at 5712726670. 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. NOAH C. HAWK Primary Examiner Art Unit 3636 /Noah Chandler Hawk/Primary Examiner, Art Unit 3636
Read full office action

Prosecution Timeline

May 20, 2024
Application Filed
Apr 05, 2026
Non-Final Rejection — §102, §103 (current)

Precedent Cases

Applications granted by this same examiner with similar technology

Patent 12599206
Umbrella Pole Brace Assembly
2y 5m to grant Granted Apr 14, 2026
Patent 12599207
A Sliding Seat Assembly for an Umbrella
2y 5m to grant Granted Apr 14, 2026
Patent 12582571
MOBILITY SYSTEMS AND METHODS
2y 5m to grant Granted Mar 24, 2026
Patent 12575998
CRUTCH WITH A CONTOURED GRIP AND A FOREARM SUPPORT
2y 5m to grant Granted Mar 17, 2026
Patent 12575651
Umbrella
2y 5m to grant Granted Mar 17, 2026
Study what changed to get past this examiner. Based on 5 most recent grants.

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Prosecution Projections

1-2
Expected OA Rounds
62%
Grant Probability
84%
With Interview (+22.0%)
2y 0m
Median Time to Grant
Low
PTA Risk
Based on 1545 resolved cases by this examiner. Grant probability derived from career allow rate.

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