Prosecution Insights
Last updated: April 19, 2026
Application No. 18/324,936

SILICON CARBIDE SEMICONDUCTOR DEVICE

Non-Final OA §112§DP
Filed
May 26, 2023
Examiner
NGUYEN, CUONG B
Art Unit
2818
Tech Center
2800 — Semiconductors & Electrical Systems
Assignee
Fuji Electric Co. Ltd.
OA Round
1 (Non-Final)
88%
Grant Probability
Favorable
1-2
OA Rounds
2y 5m
To Grant
99%
With Interview

Examiner Intelligence

Grants 88% — above average
88%
Career Allow Rate
824 granted / 938 resolved
+19.8% vs TC avg
Strong +16% interview lift
Without
With
+16.0%
Interview Lift
resolved cases with interview
Typical timeline
2y 5m
Avg Prosecution
48 currently pending
Career history
986
Total Applications
across all art units

Statute-Specific Performance

§101
0.9%
-39.1% vs TC avg
§103
41.9%
+1.9% vs TC avg
§102
33.8%
-6.2% vs TC avg
§112
18.6%
-21.4% vs TC avg
Black line = Tech Center average estimate • Based on career data from 938 resolved cases

Office Action

§112 §DP
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. Election/Restrictions Applicant's election without traverse of Species II directed to Fig. 5 (Claims 1 and 4-8 ) in the reply filed on March 3rd , 20 26 is acknowledged. Claim 1 will be allowable if rewritten to overcome the objections. The restriction requirement among Species, as set forth in the Office action mailed on January 13 rd , 2026, has been reconsidered in view of the allowability of claims to the elected invention pursuant to MPEP § 821.04(a). The restriction requirement is hereby withdrawn as to any claim that requires all the limitations of an allowable claim. Specifically, the restriction requirement of January 13 rd , 2026 is withdrawn. Claims 2-3 directed to non-elected Species are no longer withdrawn from consideration because the claim(s) requires all the limitations of an allowable claim. In view of the above noted withdrawal of the restriction requirement, applicant is advised that if any claim presented in a continuation or divisional application is anticipated by, or includes all the limitations of, a claim that is allowable in the present application, such claim may be subject to provisional statutory and/or nonstatutory double patenting rejections over the claims of the instant application. Once a restriction requirement is withdrawn, the provisions of 35 U.S.C. 121 are no longer applicable. See In re Ziegler, 443 F.2d 1211, 1215, 170 USPQ 129, 131-32 (CCPA 1971). See also MPEP § 804.01. Claim Objections Claim 1 is objected to because of the following informalities: Claim 1 recites “the semiconductor device” in lines 29-30 refers back to “a silicon carbide semiconductor device” in line 1 and should be amended to “the silicon carbide semiconductor device” for avoiding confusion. Claim 1 recites “the device” in line 42 refers back to “a silicon carbide semiconductor device” in line 1 and should be amended to “the silicon carbide semiconductor device” for avoiding confusion. 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. Claim 6 is 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 pre-AIA the applicant regards as the invention. Claim 6 recites the limitation “ the impurity concentration of the second conductivity type” in line 3-4. There is insufficient antecedent basis for this limitation in the claim. Allowable Subject Matter Claims 1-5 and 7-8 would be allowed if rewritten to overcome the objections, set forth in this Office action. Claim 6 would be allowable if rewritten to overcome the rejection(s) under 35 U.S.C. 112, set forth in this Office action. The following is an examiner' s statement of reason for allowance: the prior art made of record does not teach or fairly suggest the following: Regarding claim 1, UCHIDA et al (Pub. No.: US 2024/0371766 A1) discloses a silicon carbide semiconductor device in Figs. 1-8 , comprising: an insulated gate (51/5) having a metal-oxide-semiconductor structure; a semiconductor substrate (10) containing silicon carbide and having a first main surface and a second main surface that are opposite to each other; a first semiconductor region of a first conductivity type (31) , provided in the semiconductor substrate; a second semiconductor region of a second conductivity type (32) , provided between the first main surface of the semiconductor substrate and the first semiconductor region; a third semiconductor region of the second conductivity type (upper portion of 34) , selectively provided between the first main surface of the semiconductor substrate and the second semiconductor region, the third semiconductor region having an impurity concentration that is higher than an impurity concentration of the second semiconductor region; a device structure having the insulated gate, wherein a current that passes through a pn junction between the second semiconductor region and the first semiconductor region flows in the device structure; a gate pad (61) provided at the first main surface of the semiconductor substrate via an insulating film (44) , the gate pad being electrically connected to a gate electrode (51) constituting the metal of the insulated gate, an entire surface of the gate pad facing the third semiconductor region via the insulating film; a first electrode (62) provided at the first main surface of the semiconductor substrate, apart from the gate pad, the first electrode being electrically connected to the second semiconductor region and the third semiconductor region; a second electrode (53) provided at the second main surface of the semiconductor substrate; a fourth semiconductor region of the second conductivity type (35) , provided between the second semiconductor region and the first semiconductor region, the fourth semiconductor region facing the gate pad in a depth direction of the semiconductor device (Z2 direction) , and having an impurity concentration that is higher than the impurity concentration of the second semiconductor region and lower than the impurity concentration of the third semiconductor region; a fifth semiconductor region of the second conductivity type (lower portion of 34) , penetrating through the second semiconductor region in the depth direction of the semiconductor device and reaching the fourth semiconductor region, the fifth semiconductor region electrically connecting the first electrode to the fourth semiconductor region, and having an impurity concentration that is higher than the impurity concentration of the fourth semiconductor region (see [0136-0179]) . UCHIDA et al fails to disclose a plurality of sixth semiconductor regions of the first conductivity type, selectively provided between the first main surface of the semiconductor substrate and the third semiconductor region, each sixth semiconductor region facing the gate pad in the depth direction of the device. Claims 2- 8 depend on claim 1, and therefore also include said claimed limitation. Conclusion Any inquiry concerning this communication or earlier communications from the examiner should be directed to FILLIN "Examiner name" \* MERGEFORMAT CUONG B NGUYEN whose telephone number is FILLIN "Phone number" \* MERGEFORMAT (571)270-1509 (Email: CuongB.Nguyen@uspto.gov) . The examiner can normally be reached FILLIN "Work Schedule?" \* MERGEFORMAT Monday-Friday, 8:30 AM-5:00 PM Eastern Standard Time . 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, FILLIN "SPE Name?" \* MERGEFORMAT Steven H. Loke can be reached on FILLIN "SPE Phone?" \* MERGEFORMAT (571) 272-1657 . 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. /CUONG B NGUYEN/ Primary Examiner, Art Unit 2818
Read full office action

Prosecution Timeline

May 26, 2023
Application Filed
Mar 19, 2026
Non-Final Rejection — §112, §DP (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

1-2
Expected OA Rounds
88%
Grant Probability
99%
With Interview (+16.0%)
2y 5m
Median Time to Grant
Low
PTA Risk
Based on 938 resolved cases by this examiner. Grant probability derived from career allow rate.

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