Prosecution Insights
Last updated: September 17, 2026
Application No. 18/586,474

TC zero-current switching battery charger, TC+TC zero-current switching bidirectional charger and active DC transformer

Non-Final OA §112
Filed
Feb 24, 2024
Priority
Jun 21, 2023 — CN 202310747407.X
Examiner
PELTON, NATHANIEL R
Art Unit
Tech Center
Assignee
Bingyao Zhang
OA Round
1 (Non-Final)
75%
Grant Probability
Favorable
1-2
OA Rounds
2m
Est. Remaining
93%
With Interview

Examiner Intelligence

Grants 75% — above average
75%
Career Allowance Rate
561 granted / 749 resolved
+14.9% vs TC avg
Strong +18% interview lift
Without
With
+18.5%
Interview Lift
resolved cases with interview
Typical timeline
2y 9m
Avg Prosecution
46 currently pending
Career history
771
Total Applications
across all art units

Statute-Specific Performance

§101
1.7%
-38.3% vs TC avg
§103
57.0%
+17.0% vs TC avg
§102
20.4%
-19.6% vs TC avg
§112
12.6%
-27.4% vs TC avg
Black line = Tech Center average estimate • Based on career data from 749 resolved cases

Office Action

§112
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 . Priority Receipt is acknowledged of certified copies of papers required by 37 CFR 1.55. Drawings Figures 1-3 are described in the specification as “previous invention” and therefore should be designated by a legend such as --Prior Art-- because only that which is old is illustrated. See MPEP § 608.02(g). Corrected drawings in compliance with 37 CFR 1.121(d) are required in reply to the Office action to avoid abandonment of the application. The replacement sheet(s) should be labeled “Replacement Sheet” in the page header (as per 37 CFR 1.84(c)) so as not to obstruct any portion of the drawing figures. 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 § 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 1-7 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. With respect to claim 1, the claim is riddled with clarity and antecedent basis issues that render the claim unclear to the point that the metes and bound of the claim cannot be determined and therefore unable to provide a prior art rejection. See below for a non-exhaustive list of issues with the claims. line 1, the acronym “TC” is not spelled out and the specification fails to disclose what the term means. In line 1, “seamless connection” is unclear as it relates to a relative term and further the specification fails to define what exactly is required for a seamless connection. In line 3, the statement “bases on the patent number US10050544B2” is in narrative form and is unclear as to what/how the claim is intended to be limited, i.e. a claim cannot refer back to the entirety of another publication but must positively claim each and every element required in the claim. The specific structure of the instant claim must be claimed in the instant invention and not merely pointed back to another publication or another figure. In line 3, “the controllable inductor Lk” lacks antecedent basis. In line 4, “the rectifier outlet” lacks antecedent basis. In line 4, “the buffer circuit Cdr” lacks antecedent basis. In line 5, “the original inductor-capacitor” lacks antecedent basis. In line 7, “the capacity” lacks antecedent basis. In line 8, “the fact that the reduction” is unclear and appears to at least lack antecedent basis. In line 9, “the leakage”, “the transformer”, and “the magnetizing” all lack antecedent basis. Claims 2-7 depend from claim 1 and are rejected for the same reasons. With respect to claim 2, the recited Q1-Q8 is unclears and appears to at least lack antecedent basis. Additionally, the claim includes clarity and antecedent basis issues in the same manner as detailed in claim 1. With respect to claim 3, “the step-down transformer T1” and “step-up transformer T11” lack antecedent basis. Additionally, the claim includes clarity and antecedent basis issues in the same manner as detailed in claim 1. With respect to claim 4, “the primary coils N1 and N11” lack antecedent basis. Additionally, the claim includes clarity and antecedent basis issues in the same manner as detailed in claim 1. With respect to claims 5-7, “the TC charger CTC and the TC+TC” charger statement appears to at least lack antecedent basis but also lacks clarity as to what is even attempted to be claimed. Conclusion The prior art made of record and not relied upon is considered pertinent to applicant's disclosure. US 5,946,200 to Kim et al. relates to a DC/DC converter with a soft switch branch for a charger to implement zero current switching and, as best understood by the Examiner given the severity of the clarity issues above, appears to relate to the inventive concept of the instant invention. Any inquiry concerning this communication or earlier communications from the examiner should be directed to NATHANIEL R PELTON whose telephone number is (571)270-1761. The examiner can normally be reached M-F 9am to 5pm. 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, Julian Huffman can be reached at 571-272-2147. 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. /NATHANIEL R PELTON/Primary Examiner, Art Unit 2859
Read full office action

Prosecution Timeline

Feb 24, 2024
Application Filed
Aug 21, 2026
Non-Final Rejection mailed — §112 (current)

Precedent Cases

Applications granted by this same examiner with similar technology

Patent 12734913
AUTOMATED STORAGE SYSTEM WITH A CONTAINER VEHICLE AND A CHARGING SYSTEM
2y 5m to grant Granted Sep 15, 2026
Patent 12728765
VEHICLE BATTERY OVERCHARGING PREVENTION SYSTEM AND METHOD
3y 6m to grant Granted Sep 08, 2026
Patent 12715329
VEHICLE CHARGING SYSTEMS AND METHODS FOR MITIGATING ELECTRIC VEHICLE SUPPLY EQUIPMENT OVERHEATING
3y 5m to grant Granted Aug 25, 2026
Patent 12706473
CHARGER CONTROL APPARATUS, CHARGER CONTROL METHOD, AND NON-TRANSITORY COMPUTER-READABLE MEDIUM
3y 4m to grant Granted Aug 11, 2026
Patent 12697895
VEHICLE CHARGING METHOD AND APPARATUS
3y 4m to grant Granted Aug 04, 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
75%
Grant Probability
93%
With Interview (+18.5%)
2y 9m (~2m remaining)
Median Time to Grant
Low
PTA Risk
Based on 749 resolved cases by this examiner. Grant probability derived from career allowance rate.

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