Prosecution Insights
Last updated: October 02, 2026
Application No. 18/427,535

HIGH GAIN, LOW-OFFSET, CLASS AB AMPLIFIER CIRCUIT

Non-Final OA §103
Filed
Jan 30, 2024
Priority
Feb 27, 2023 — provisional 63/448,469
Examiner
CHOE, HENRY
Art Unit
Tech Center
Assignee
Snap Inc.
OA Round
2 (Non-Final)
92%
Grant Probability
Favorable
2-3
OA Rounds
0m
Est. Remaining
90%
With Interview

Examiner Intelligence

Grants 92% — above average
92%
Career Allowance Rate
1261 granted / 1368 resolved
+32.2% vs TC avg
Minimal -2% lift
Without
With
+-1.7%
Interview Lift
resolved cases with interview
Fast prosecutor
1y 10m
Avg Prosecution
26 currently pending
Career history
1373
Total Applications
across all art units

Statute-Specific Performance

§101
1.0%
-39.0% vs TC avg
§103
38.8%
-1.2% vs TC avg
§102
46.8%
+6.8% vs TC avg
§112
3.8%
-36.2% vs TC avg
Black line = Tech Center average estimate • Based on career data from 1368 resolved cases

Office Action

§103
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 . Drawings The drawings are objected to under 37 CFR 1.83(a). The drawings must show every feature of the invention specified in the claims. Therefore, by applying a voltage gain of greater than 180,000 to the differential input signal recited in the claims 1 and 18 must be shown or the feature(s) canceled from the claim(s). No new matter should be entered. Corrected drawing sheets in compliance with 37 CFR 1.121(d) are required in reply to the Office action to avoid abandonment of the application. Any amended replacement drawing sheet should include all of the figures appearing on the immediate prior version of the sheet, even if only one figure is being amended. The figure or figure number of an amended drawing should not be labeled as “amended.” If a drawing figure is to be canceled, the appropriate figure must be removed from the replacement sheet, and where necessary, the remaining figures must be renumbered and appropriate changes made to the brief description of the several views of the drawings for consistency. Additional replacement sheets may be necessary to show the renumbering of the remaining figures. Each drawing sheet submitted after the filing date of an application must be labeled in the top margin as either “Replacement Sheet” or “New Sheet” pursuant to 37 CFR 1.121(d). If the changes are not accepted by the examiner, the applicant will be notified and informed of any required corrective action in the next Office action. The objection to the drawings will not be held in abeyance. 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) 1-3, 5-7, 9, 10 and 13-20 are rejected under 35 U.S.C. 103 as being unpatentable over [Nishimura (Fig. 1); 2009/0289930]. Regarding claims 1 and 18, the limitation of “by applying a voltage gain of greater than 180,000to the differential input signal” is obvious based on the intended use of the invention. The remainder of the claims rejections is same as the previous office action except the rejection was done through the 102 rejection. Regarding claims 2 and 19, exactly same as the previous office action except the rejection was done through the 102 rejection. Regarding claim 3, exactly same as the previous office action except the rejection was done through the 102 rejection. Regarding claim 5, exactly same as the previous office action except the rejection was done through the 102 rejection. Regarding claims 6 and 20, exactly same as the previous office action except the rejection was done through the 102 rejection. Regarding claim 7, exactly same as the previous office action except the rejection was done through the 102 rejection. Regarding claim 9, exactly same as the previous office action except the rejection was done through the 102 rejection. Regarding claim 10, exactly same as the previous office action except the rejection was done through the 102 rejection. Regarding claims 13-17, the limitations recited in the claims are obvious based on the intend use of the invention. Allowable Subject Matter Claims 4, 8, 11 and 12 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. Reasons for Allowance The following is an examiner’s statement of reasons for allowance: Regarding claim 4, the closest prior art of record, Nishimura does not disclose the following limitation: the bias voltages are operative to establish -------------second folded double cascode stage. Regarding claim 8, the closest prior art of record, Nishimura does not disclose the following limitation: wherein the first folded double cascode stage -----------------at least two cascode transistors connected in series between a supply node and the second drive signal. Regarding claim 11, the closest prior art of record, Nishimura does not disclose the following limitation: wherein the output stage further comprises one or more pole splitting capacitors -------- one or more pole splitting capacitors. 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 Any inquiry concerning this communication or earlier communications from the examiner should be directed to Henry Choe whose telephone number is (571)272-1760. The examiner can normally be reached MONDAY-FRIDAY 5AM-11:00PM. 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, Jessica Han can be reached at 571-272-2078. 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. /HENRY CHOE/ Primary Examiner, Art Unit 2843
Read full office action

Prosecution Timeline

Jan 30, 2024
Application Filed
Jun 11, 2026
Non-Final Rejection mailed — §103
Jul 20, 2026
Interview Requested
Aug 07, 2026
Response Filed
Aug 20, 2026
Non-Final Rejection mailed — §103 (current)

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Study what changed to get past this examiner. Based on 5 most recent grants.

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Prosecution Projections

2-3
Expected OA Rounds
92%
Grant Probability
90%
With Interview (-1.7%)
1y 10m (~0m remaining)
Median Time to Grant
Moderate
PTA Risk
Based on 1368 resolved cases by this examiner. Grant probability derived from career allowance rate.

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