Prosecution Insights
Last updated: July 17, 2026
Application No. 18/441,259

METHOD OF ENABLING PARITY-TIME SYMMETRIC OPTICAL WAVEGUIDES USING LIQUIDS

Non-Final OA §112
Filed
Feb 14, 2024
Priority
Mar 16, 2023 — provisional 63/452,494 +1 more
Examiner
STAHL, MICHAEL J
Art Unit
2874
Tech Center
2800 — Semiconductors & Electrical Systems
Assignee
Government of the United States, as represented by the Secretary of the Air Force
OA Round
1 (Non-Final)
90%
Grant Probability
Favorable
1-2
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

§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 Objections Claims 1-30 are objected to for the following informalities: Claim 1 is objected to because line 21 recites "liquid host" instead of "fluid host". Claims 3 and 17 are objected to because they are missing a comma between "titanium" and "chromium" in line 3. Claims 3 and 17 are also objected to because line 4 recites "and" instead of "or". Claims 7 and 22 are objected to because they are missing "or" at the end of line 4 (first line of clause b); that is, "or" should be inserted between "circular," and "triangular". Claim 13 is objected to because it is missing a phrase such as "the process comprising" at the start of line 21. Alternatively, a step term such as "providing" could be inserted after each of "a)", "b)", and "c)". It is noted that lines 2-20 as presently written merely recite what the optofluidic device comprises. Since claim 13 is a process claim, the process step(s) should be clearly delineated. Claim 19 is objected to because line 2 recites "has" instead of "having". Claim 28 is objected to because it is missing "or" between "equal to" and "lower than". Claims 2-12 and 14-30 are technically objected to by dependence from claims 1 or 13. 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. Claims 3-4 and 17-18 are 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. Claims 3 and 17 are indefinite because they recite the term "preferably", which makes the scope of those claims unclear (see MPEP 2173.05(d)). Preferred metal materials may be set forth in claims which depend from claims 3 or 17. Claims 4 and 18 are indefinite by dependence from claims 3 or 17. Claim 4 is further indefinite because it appears to contain the text of two separate claims. The portion which reads "The optofluidic device of Claim 1 wherein said at least one fluid cavity has at least one fluid inlet and at least one fluid outlet." should be removed from claim 4 and presented as a new claim. Allowable Subject Matter Claims 1-30 would be allowable if they are suitably amended to overcome the pertinent objections and indefiniteness rejections above. US 2023/0131116 A1 is regarded as the closest prior art of record. '116 discloses many of the elements of claims 1 and 13 for example in [0018]-[0023], [0039]-[0044], and fig. 2. It is noted that the "film" of '116 at [0020] and [0041] corresponds to the "pattern material" of claims 1 and 13. However '116 does not disclose or suggest disposing an additional film on one of the patterns, as recited at claim 1 line 12 and claim 13 line 11, in combination with all the other limitations. Conclusion The additional references listed on the attached 892 form are considered generally relevant to the subject matter of this application. Several of them disclose coupling between optical waveguides in a liquid environment. 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

Feb 14, 2024
Application Filed
Apr 22, 2026
Non-Final Rejection mailed — §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

1-2
Expected OA Rounds
90%
Grant Probability
98%
With Interview (+7.5%)
1y 11m (~0m remaining)
Median Time to Grant
Low
PTA Risk
Based on 1268 resolved cases by this examiner. Grant probability derived from career allowance rate.

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