Prosecution Insights
Last updated: April 19, 2026
Application No. 18/510,819

SYSTEM AND METHOD OF FABRICATING LOW-LOSS AND LOW-NOISE WAVEGUIDES FOR VISIBLE WAVELENGTH APPLICATIONS

Non-Final OA §102§103§112
Filed
Nov 16, 2023
Examiner
RAHLL, JERRY T
Art Unit
2874
Tech Center
2800 — Semiconductors & Electrical Systems
Assignee
U.S. Department of Energy
OA Round
1 (Non-Final)
90%
Grant Probability
Favorable
1-2
OA Rounds
2y 1m
To Grant
98%
With Interview

Examiner Intelligence

Grants 90% — above average
90%
Career Allow Rate
1089 granted / 1215 resolved
+21.6% vs TC avg
Moderate +8% lift
Without
With
+8.4%
Interview Lift
resolved cases with interview
Fast prosecutor
2y 1m
Avg Prosecution
46 currently pending
Career history
1261
Total Applications
across all art units

Statute-Specific Performance

§101
0.6%
-39.4% vs TC avg
§103
43.9%
+3.9% vs TC avg
§102
42.4%
+2.4% vs TC avg
§112
10.5%
-29.5% vs TC avg
Black line = Tech Center average estimate • Based on career data from 1215 resolved cases

Office Action

§102 §103 §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 . Election/Restrictions Applicant’s election of Invention I, Claims 1-6, in the reply filed on 15 December 2025 is acknowledged. Because applicant did not distinctly and specifically point out the supposed errors in the restriction requirement, the election has been treated as an election without traverse (MPEP § 818.01(a)). Claims 7-20 are withdrawn from further consideration pursuant to 37 CFR 1.142(b) as being drawn to a nonelected invention, there being no allowable generic or linking claim. Drawings Figure 1 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. . Claims 1-6 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. The term “low surface roughness” in Claim 1 is a relative term which renders the claim indefinite. The term “low surface roughness” is not defined by the claim, the specification does not provide a standard for ascertaining the requisite degree, and one of ordinary skill in the art would not be reasonably apprised of the scope of the invention. Therefore, it is not possible to determine whether a waveguide has a surface which anticipates the claim limitation. For examination purposes, any waveguide having the claimed structure of Claim 1 shall be considered to have a “low surface roughness.” Claims 2-6 depend from Claim 1 and do not remedy the indefiniteness of Claim 1. Therefore, Claims 2-6 are indefinite for the same reasoning. The term “semi-flexible” in Claim 2 is a relative term which renders the claim indefinite. The term “semi-flexibility” is not defined by the claim, the specification does not provide a standard for ascertaining the requisite degree, and one of ordinary skill in the art would not be reasonably apprised of the scope of the invention. Therefore, it is not possible to determine whether a given glass capillary tube anticipates the claim limitation. For examination purposes, a glass capillary tube having any flexible properties shall be considered to be “semi-flexible.” Claim Rejections - 35 USC § 102 In the event the determination of the status of the application as subject to AIA 35 U.S.C. 102 and 103 (or as subject to pre-AIA 35 U.S.C. 102 and 103) is incorrect, any correction of the statutory basis (i.e., changing from AIA to pre-AIA ) for the rejection will not be considered a new ground of rejection if the prior art relied upon, and the rationale supporting the rejection, would be the same under either status. 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 1-4 are rejected under 35 U.S.C. 102(a)(1) as being anticipated by US Patent Application Publication 2009/0208175 to Hongo et al. (“US1”). Regarding Claim 1, US1 describes a waveguide (1B, see Fig 6) having low surface roughness, adapted to minimize loss and noise while producing a circular beam that can be used in the visible or short-wave spectral regime, the waveguide comprising: a glass capillary tube (11, see [0068]) having an outer surface and an inner surface defining a hollow core (14, see [0110]); a metal layer (12, see [0104]) deposited on at least the inner surface; and a polymer layer (15, see [0104]-[0105]) overcoat deposited on at least the metal layer and in fluid communication with the hollow core. Regarding Claim 2, US1 describes the glass capillary tube is comprised of a semi-flexible glass capillary (see [0068]). Regarding Claim 3, US1 describes the metal layer is a silver metal plate plated on the inner surface of the glass capillary tube (see [0069], [0104]). Regarding Claim 4, US1 describes the polymer layer is comprised of a cyclic olefin copolymer (see [0104]). Claim Rejections - 35 USC § 103 In the event the determination of the status of the application as subject to AIA 35 U.S.C. 102 and 103 (or as subject to pre-AIA 35 U.S.C. 102 and 103) is incorrect, any correction of the statutory basis (i.e., changing from AIA to pre-AIA ) for the rejection will not be considered a new ground of rejection if the prior art relied upon, and the rationale supporting the rejection, would be the same under either status. 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. This application currently names joint inventors. In considering patentability of the claims the examiner presumes that the subject matter of the various claims was commonly owned as of the effective filing date of the claimed invention(s) absent any evidence to the contrary. Applicant is advised of the obligation under 37 CFR 1.56 to point out the inventor and effective filing dates of each claim that was not commonly owned as of the effective filing date of the later invention in order for the examiner to consider the applicability of 35 U.S.C. 102(b)(2)(C) for any potential 35 U.S.C. 102(a)(2) prior art against the later invention. Claims 5-6 are rejected under 35 U.S.C. 103 as being unpatentable over US1 as applied to Claim 1 above. US1 does not describe the hollow core having a diameter of about 300µm or the glass capillary tube is about 1 meter in length. Before the effective filing date of the claimed invention, it would have been obvious to one of ordinary skill in the art to form the hollow core and capillary tube of US1 having the claimed dimensions, since such a modification would have involved a mere change in the size of a component. A change in size is generally recognized as being within the level of ordinary skill in the art. In re Rose, 105 USPQ 237 (CCPA 1955). Conclusion The prior art cited in the attached form PTO-892 are made of record and considered pertinent to applicant's disclosure. The cited prior art describes various waveguides with hollow core structures. Any inquiry concerning this communication or earlier communications from the examiner should be directed to JERRY RAHLL whose telephone number is (571)272-2356. The examiner can normally be reached M-F 9:00am-5:00pm. 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, Uyen-Chau Le can be reached at 571-272-2397. 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. /JERRY RAHLL/Primary Examiner, Art Unit 2874
Read full office action

Prosecution Timeline

Nov 16, 2023
Application Filed
Jan 05, 2026
Non-Final Rejection — §102, §103, §112 (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
90%
Grant Probability
98%
With Interview (+8.4%)
2y 1m
Median Time to Grant
Low
PTA Risk
Based on 1215 resolved cases by this examiner. Grant probability derived from career allow rate.

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