Prosecution Insights
Last updated: April 19, 2026
Application No. 18/291,992

FUSION SPLICER

Non-Final OA §103
Filed
Jan 25, 2024
Examiner
LEPISTO, RYAN A
Art Unit
2874
Tech Center
2800 — Semiconductors & Electrical Systems
Assignee
Sumitomo Electric Industries, Ltd.
OA Round
1 (Non-Final)
88%
Grant Probability
Favorable
1-2
OA Rounds
2y 0m
To Grant
96%
With Interview

Examiner Intelligence

Grants 88% — above average
88%
Career Allow Rate
1008 granted / 1146 resolved
+20.0% vs TC avg
Moderate +8% lift
Without
With
+7.7%
Interview Lift
resolved cases with interview
Fast prosecutor
2y 0m
Avg Prosecution
48 currently pending
Career history
1194
Total Applications
across all art units

Statute-Specific Performance

§101
0.3%
-39.7% vs TC avg
§103
45.3%
+5.3% vs TC avg
§102
35.6%
-4.4% vs TC avg
§112
11.4%
-28.6% vs TC avg
Black line = Tech Center average estimate • Based on career data from 1146 resolved cases

Office Action

§103
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 . 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 1-4 are rejected under 35 U.S.C. 103 as being unpatentable over Tanaka et al (JP 2017-21190A) (the reference and translation copies were provided in the 2/1/24 IDS) and Kanda et al (US 7,151,877 B2). Tanaka teaches: Claim 1: A fusion splicer (20, Fig. 3) comprising: an optical fiber holder (21, 22) holding an optical fiber (10); a rotation mechanism (part of 21) rotating the optical fiber holder around an axis extending along the optical fiber (10) (P0039); a bending portion bending the optical fiber (10) (P0034, 0036); a light source (31) allowing light from the side of the optical fiber (10) to be incident on the optical fiber bent by the bending portion (P0034, 0036); and a power supply unit (part of 31) supplying power to the light source (31), wherein a tip of the optical fiber (10) protrudes from an end of the optical fiber holder (21, 22) (see Fig. 3), wherein the rotation mechanism (part of 21) is disposed on the opposite side of the end of the optical fiber holder (21, 22) in the axial direction extending along the optical fiber (10) (see Fig. 3), wherein the bending portion and the light source (31) are disposed on the opposite side of the optical fiber holder (21, 22) interposing the rotation mechanism in the axial direction (see Figs. 3, 4; P0032, 0046). Claim 4: The fusion splicer according to claim 1, comprising a reflection portion (the cladding 12 of one fiber reflects the light to the next fiber) reflecting light from the light source (31) toward the optical fiber (P0046). Tanaka does not teach expressly wherein the bending portion includes a bending adjustment unit adjusting a bending amount of the optical fiber: Claim 3: The fusion splicer according to claim 1, wherein the optical fiber holder has a pressure adjustment unit adjusting pressure applied to the optical fiber. Kanda teaches a bending portion (21) including a bending adjustment unit (50) for adjusting a bending amount of an optical fiber(s) for fusion splicing (C5 L63 – C6 L18). Bending the optical fibers with inherently increase the pressure applied to that portion of the fiber so the bending members (21) and the bending adjustment unit (50) together with the tensile strength of the fiber will “adjust pressure applied to the optical fiber”. Tanaka and Kanda are analogous art because they are from the same field of endeavor, optical fiber fusion splicers. At the time of the effective filing date of the claimed invention, it would have been obvious to a person of ordinary skill in the art to modify the fusion splicer of Tanaka to include a bending and pressure adjustment units as taught by Kanda. The motivation for doing so would have been to allow for better alignment of the fiber ends to be spliced. Tanaka and Kanda does not state: Claim 2: The fusion splicer according to claim 1, further comprising a light source adjustment unit adjusting power supplied to the light source. The limitation “adjusting power supplied to the light source” is broad enough to cover turning the light source off and on as being adjusting power supplied to the light source. It would have been obvious to one of ordinary skill in the art at the time the invention was effectively filed to try turning a light source on and off as needed, since it has been held that “it is obvious to try - choosing from a finite number of identified, predictable solutions, with a reasonable expectation of success” is a rationale for arriving at a conclusion of obviousness. In re KSR International Co. v. Teleflex Inc. Turning an LED source on and off is clearly predictable and would succeed in Tanaka and Kanda. Claim 5 is rejected under 35 U.S.C. 103 as being unpatentable over Tanaka and Kanda as applied to claim 1 above, and further in view of Hattori et al (US 6,668,128 B2). Tanaka and Kanda teach the fusion splicer previously discussed. Tanaka and Kanda do not teach expressly: Claim 5: The fusion splicer according to claim 1, further comprising a holder stand with the optical fiber holder mounted on; wherein the optical fiber holder is detachable from the holder stand. Hattori teaches an optical fiber fusion splicer with a holder stand (4) with an optical fiber holder (3) mounted on and wherein the optical fiber holder (3) is detachable from the holder stand (4) (C6 L59 – C7 L31). Tanaka, Kanda and Hattori are analogous art because they are from the same field of endeavor, optical fiber fusion splicers. At the time of the effective filing date of the claimed invention, it would have been obvious to a person of ordinary skill in the art to modify the fusion splicer of Tanaka and Kanda to include an optical fiber holder as taught by Hattori. The motivation for doing so would have been to better support the fiber so the fiber(s) do not move during the splicing process. Contact Information Any inquiry concerning this communication or earlier communications from the examiner should be directed to RYAN A LEPISTO whose telephone number is (571)272-1946. The examiner can normally be reached on 8AM-5PM EST M-F. 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, Thomas Hollweg can be reached on 571-270-1739. The fax phone number for the organization where this application or proceeding is assigned is 571-273-8300. Information regarding the status of an application may be obtained from the Patent Application Information Retrieval (PAIR) system. Status information for published applications may be obtained from either Private PAIR or Public PAIR. Status information for unpublished applications is available through Private PAIR only. For more information about the PAIR system, see http://pair-direct.uspto.gov. Should you have questions on access to the Private PAIR system, contact the Electronic Business Center (EBC) at 866-217-9197 (toll-free). If you would like assistance from a USPTO Customer Service Representative or access to the automated information system, call 800-786-9199 (IN USA OR CANADA) or 571-272-1000. /RYAN A LEPISTO/Primary Examiner, Art Unit 2874
Read full office action

Prosecution Timeline

Jan 25, 2024
Application Filed
Jan 23, 2026
Non-Final Rejection — §103 (current)

Precedent Cases

Applications granted by this same examiner with similar technology

Patent 12591090
HOLLOW-CORE PHOTONIC CRYSTAL FIBER BASED EDIBLE OIL SENSOR
2y 5m to grant Granted Mar 31, 2026
Patent 12585077
FIBER OPTIC HOUSING AND CLIP
2y 5m to grant Granted Mar 24, 2026
Patent 12554069
MULTI-DIRECTIONAL ADAPTIVE OPTICAL DEVICE
2y 5m to grant Granted Feb 17, 2026
Patent 12541063
FERRULE HOLDER FOR MINIATURE MT FERRULE AND ADAPTER INTERFACE FOR MATING WITH FIBER OPTIC CONNECTORS
2y 5m to grant Granted Feb 03, 2026
Patent 12535641
OPTICAL CONNECTOR AND OPTICAL CONNECTOR MODULE
2y 5m to grant Granted Jan 27, 2026
Study what changed to get past this examiner. Based on 5 most recent grants.

AI Strategy Recommendation

Get an AI-powered prosecution strategy using examiner precedents, rejection analysis, and claim mapping.
Powered by AI — typically takes 5-10 seconds

Prosecution Projections

1-2
Expected OA Rounds
88%
Grant Probability
96%
With Interview (+7.7%)
2y 0m
Median Time to Grant
Low
PTA Risk
Based on 1146 resolved cases by this examiner. Grant probability derived from career allow rate.

Sign in with your work email

Enter your email to receive a magic link. No password needed.

Personal email addresses (Gmail, Yahoo, etc.) are not accepted.

Free tier: 3 strategy analyses per month