Prosecution Insights
Last updated: July 17, 2026
Application No. 18/424,609

FOLDED WAVEGUIDE PHASE SHIFTERS

Final Rejection §102§112
Filed
Jan 26, 2024
Priority
Aug 17, 2018 — provisional 62/719,558 +3 more
Examiner
STAHL, MICHAEL J
Art Unit
2874
Tech Center
2800 — Semiconductors & Electrical Systems
Assignee
Taiwan Semiconductor Manufacturing Company, Ltd.
OA Round
2 (Final)
90%
Grant Probability
Favorable
3-4
OA Rounds
0m
Est. Remaining
98%
With Interview

Examiner Intelligence

Grants 90% — above average
90%
Career Allowance Rate
1141 granted / 1268 resolved
+22.0% vs TC avg
Moderate +8% lift
Without
With
+7.5%
Interview Lift
resolved cases with interview
Fast prosecutor
1y 11m
Avg Prosecution
27 currently pending
Career history
1289
Total Applications
across all art units

Statute-Specific Performance

§101
0.5%
-39.5% vs TC avg
§103
38.5%
-1.5% vs TC avg
§102
41.6%
+1.6% vs TC avg
§112
17.4%
-22.6% vs TC avg
Black line = Tech Center average estimate • Based on career data from 1268 resolved cases

Office Action

§102 §112
Notice of Pre-AIA or AIA Status The present application, filed after March 16, 2013, is being examined under the first inventor to file provisions of the AIA . Claim Rejections - 35 USC § 112 The following is a quotation of the first paragraph of 35 U.S.C. 112(a): (a) IN GENERAL.—The specification shall contain a written description of the invention, and of the manner and process of making and using it, in such full, clear, concise, and exact terms as to enable any person skilled in the art to which it pertains, or with which it is most nearly connected, to make and use the same, and shall set forth the best mode contemplated by the inventor or joint inventor of carrying out the invention. Claims 14-20 and 22-23 are rejected under 35 U.S.C. 112(a) as failing to comply with the written description requirement. The claims contain subject matter which was not described in the specification in such a way as to reasonably convey to one skilled in the relevant art that the inventor or a joint inventor, at the time the application was filed, had possession of the claimed invention. Claim 14 was amended to recite discrete enclosed shapes comprising a plurality of conic sections. This is regarded as new matter because the original disclosure does not mention the term "conic section", and because that term covers shapes such as parabolas and hyperbolas which are not disclosed. Claims 15-20 and 22-23 are rejected by dependence from claim 14. Replacing "comprising of a plurality of conic sections" with "comprising a plurality of circles or ellipses" would suffice to overcome this rejection, since circles and ellipses are shown in the original disclosure. 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 21 is rejected under 35 U.S.C. 112(b) as being indefinite for failing to particularly point out and distinctly claim the subject matter which the inventor or a joint inventor regards as the invention. Claim 21 is indefinite because there is insufficient antecedent basis for "the core" or "the cladding". Claim 21 depends from claim 9 but those elements are not introduced until claim 12. 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. Claims 9 and 12-13 are rejected under 35 U.S.C. 102(a)(1) as being anticipated by US 2012/0099813 A1 (previously made of record via information disclosure statement). Claim 9: '813 discloses a modulator, comprising (see mainly figs. 2D, 3A, and 5): a first waveguide 751 (fig. 5; 751 can be a waveguide per the last sentence of [0096]); and a second waveguide (contained within phase shifter 10), comprising: a light input end (left end of 300 as oriented in figs. 2D and 5), a light output end (right end of 300 as oriented in figs. 2D and 5), a first semiconductor material (undoped silicon of region 300, [0058]), a second semiconductor material (impurity region 104) different from the first semiconductor material, the second semiconductor material contacting the first semiconductor material along a triangular boundary area CP14 (fig. 2D) wherein the triangular boundary area extends from one end of a core width of the second waveguide to a second end of the core width of the second waveguide (the core width being taken along the Y direction in fig. 3A, similar to the width direction of the instant application at fig. 3C; note corresponding boundary CP10a; fig. 3A can be based on earlier embodiments as stated in [0067]), and wherein a first light output of the first waveguide is combined with a second light output from the light output end (via coupler 601), wherein the first waveguide and the second waveguide are part of a processor (either fig. 5 can be taken as a processor itself in the sense of processing optical signals, or can be part of one of the processors mentioned in [0116]), and wherein the boundary area is greater than a length from the light input end to the light output end multiplied by a core width of the second waveguide. Claim 12: The modulator further comprises a core (layer above 160a in fig. 3A, [0069]) and a cladding 160a, wherein the core is part of a folded waveguide phase shifter in which light may propagate through from the light input end to the light output end, and wherein the modulator comprises a Mach-Zehnder modulator that utilizes the folded waveguide phase shifter (fig. 5). Claim 13: The modulator comprises at least one of two arms optically coupled between cascaded Y-branch couplers 401 / 601 disposed in a semiconductor material (fig. 5). Response to Arguments All rejections of the 12/3/2025 action were overcome by the 2/26/2026 response. Claims 9 and 12-13 have been rejected in the present action using a different reference to account for the amendments to claim 9. Independent claim 14 and its dependent claims have been rejected in the present action for insufficient disclosure. Allowable Subject Matter Claims 1 and 3-8 are allowed. Claims 14-20 and 22-23 would be allowable if claim 14 is amended to excise the new matter identified above, for example by adopting the language suggested earlier at Page 2. 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. Contact Information Examiner: 571-272-2360 Examiner's direct supervisor: 571-272-2397 Official correspondence by fax: 571-273-8300 Information regarding the status of an application may be obtained from Patent Center. Should you have questions about Patent Center, contact the Electronic Business Center (EBC) at 866-217-9197 (toll-free). /Michael Stahl/Primary Examiner, Art Unit 2874
Read full office action

Prosecution Timeline

Jan 26, 2024
Application Filed
Dec 03, 2025
Non-Final Rejection mailed — §102, §112
Feb 26, 2026
Response Filed
May 29, 2026
Final Rejection mailed — §102, §112 (current)

Precedent Cases

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

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Prosecution Projections

3-4
Expected OA Rounds
90%
Grant Probability
98%
With Interview (+7.5%)
1y 11m (~0m remaining)
Median Time to Grant
Moderate
PTA Risk
Based on 1268 resolved cases by this examiner. Grant probability derived from career allowance rate.

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