Prosecution Insights
Last updated: August 15, 2026
Application No. 18/727,790

ARC EXTINGUISHING UNIT OF MOLDED CASE CIRCUIT BREAKER

Non-Final OA §102§103
Filed
Jul 10, 2024
Priority
Jan 13, 2022 — RE 10-2022-0005428 +2 more
Examiner
BOLTON, WILLIAM A
Art Unit
Tech Center
Assignee
LS Electric Co., Ltd.
OA Round
1 (Non-Final)
89%
Grant Probability
Favorable
1-2
OA Rounds
0m
Est. Remaining
95%
With Interview

Examiner Intelligence

Grants 89% — above average
89%
Career Allowance Rate
683 granted / 766 resolved
+29.2% vs TC avg
Moderate +6% lift
Without
With
+5.8%
Interview Lift
resolved cases with interview
Fast prosecutor
1y 10m
Avg Prosecution
24 currently pending
Career history
783
Total Applications
across all art units

Statute-Specific Performance

§101
0.3%
-39.7% vs TC avg
§103
54.9%
+14.9% vs TC avg
§102
30.0%
-10.0% vs TC avg
§112
10.6%
-29.4% vs TC avg
Black line = Tech Center average estimate • Based on career data from 766 resolved cases

Office Action

§102 §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 Objections Claims 1-15 are objected to because: Claims 1-15, lines 1-2, “arc distinguishing unit” seem to typographical errors. Claim 3, line 2, “the same shape” lacks antecedent basis. Claim 3, line 1, “the insulating member” lacks antecedent basis. Claim 3, line 2, “the grid” lacks antecedent basis. Claim 4, lines 1-2, “the insulating member” lacks antecedent basis. Claim 4, line 2, “the grid” lacks antecedent basis. Claim 5, line 3, “the remaining insulating members” lacks antecedent basis. Claim 5, lines 4-5, “the remaining grids” lacks antecedent basis. Claim 6, line 2, “the grid” lacks antecedent basis. Claim 6, line 2, “the insulating member” lacks antecedent basis. Claim 7, line 2, “the grid” lacks antecedent basis. Claim 7, lines 2-3, “the insulating member” lacks antecedent basis. Claim 10, lines 1-2, “the first insulating member” and “the second insulating member” lack antecedent basis. Claim 10, line 2, “the same shape” lacks antecedent basis. Claim 11, lines 1-2, “the first insulating member” and “the second insulating member” lack antecedent basis. Claim 11, line 2, “the grid” lacks antecedent basis. Claim 12, lines 1-2, “the first insulating member” and “the second insulating member” lack antecedent basis. Claim 12, line 2, “the grid” lacks antecedent basis. Claim 13, line 2, “the grid” lacks antecedent basis. Claim 13, line 2, “the first insulating member” and “the second insulating member” lack antecedent basis. Claim 14, line 2, “the grid” lacks antecedent basis. Claim 14, lines 3-4, “the first insulating member” and “the second insulating member” lack antecedent basis. Claim 15, line 2, “the first insulating member” and “the second insulating member” lack antecedent basis. Claim 15, line 3, “the grid” lacks antecedent basis. Appropriate correction is required. 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 1-3, 6-10 and 12-14 are rejected under 35 U.S.C. 102 (a)(1) as being anticipated by Chen et al, Chen et al, CN1558439 [Chen]. Regarding claim 1, Chen discloses (figs.1-2) an arc extinguishing unit (1) of a molded case circuit breaker (11), the arc distinguishing unit comprising: a first side plate and a second side plate (implicitly disclose) disposed to be spaced apart from each other by a predetermined distance; a plurality of grids (2) disposed at predetermined intervals between the first and second side plates; and insulating members (3) disposed in surface contact with the plurality of grids (2), respectively. Regarding claim 2, Chen further discloses where the grids (2) and the insulating members (3) are alternately disposed with one another. Regarding claim 3, Chen further discloses where the insulating member (3) is formed in the same shape as that of the grid (2). Regarding claim 6, Chen further discloses where insertion grooves (implicitly disclose) into which the grid (2) and the insulating member (3) are inserted together are disposed in the first and second side plates (implicitly disclose). Regarding claim 7, Chen further discloses where an entry portion adjacent to a contact unit (5, 6) in the grid (2) extends from an insulator entry portion adjacent to the contact unit (5, 6) in the insulating member (3) [see fig.1b]. Regarding claim 8, Chan discloses (figs.1-2) an arc extinguishing unit (1) of a molded case circuit breaker (11), the arc distinguishing unit comprising: a first side plate and a second side plate (implicitly disclose) disposed to be spaced apart from each other by a predetermined distance; and a plurality of grid-insulator combinations (2, 3) disposed at predetermined intervals between the first and second side plates (implicitly disclose), where the grid-insulator combinations (2, 3) comprise: a plurality of grids (2) disposed at predetermined intervals between the first and second side plates (implicitly disclose); and insulating members (3) coupled in surface contact with upper or lower surfaces of the plurality of grids (2), respectively. Regarding claim 9, Chen discloses (figs.1-2) an arc extinguishing unit (1) of a molded case circuit breaker (11), the arc extinguishing unit (1) comprising: a first side plate and a second side plate (implicitly disclose) disposed to be spaced apart from each other by a predetermined distance; a plurality of grids (2) disposed between the first and second side plates (implicitly disclose); first insulating members (3) disposed in surface contact with first surfaces of the plurality of grids (2), respectively; and second insulating members (3) disposed in surface contact with second surfaces of the plurality of grids (2), respectively [insulating member sandwich between grids]. Regarding claim 10, Chen further discloses where the first insulating member (3) and the second insulating member (3) are formed in the same shape as that of the grid (2). Regarding claim 12, Chen further discloses where the first insulating member (3) and the second insulating member (3) are disposed in parallel to the grid (2). Regarding claim 13, Chen further discloses where insertion grooves (implicitly disclose in the side walls) into which the grid (2) and the first insulating member (3), and the second insulating member (3) are inserted together are disposed in the first and second side plates (implicitly disclose). Regarding claim 14, Chen further discloses where an entry portion or cutout portion facing a contact unit (5, 6) in the grid (2) extends (protrudes) from a first insulator entry portion or first insulator cutout portion of the first insulating member(3) and a second insulator entry portion or second insulator cutout portion of the second insulating member (3) [see fig.1b]. Claim Rejections - 35 USC § 103 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. Claims 4-5, 11 and 15 are rejected under 35 U.S.C. 103 as being unpatentable over Chen in view of Takeshi et al, JP 2014154492 [Takeshi]. Regarding claim 4, Chen fails to explicitly disclose wherein a thickness of the insulating member is formed to be thinner than that of the grid. Takeshi shows (fig.7) a thickness of an insulating member (21) is formed to be thinner than that a conductor plate (19) of a grid (17). It would have been obvious to one of ordinary skill in the art before the effective filing date of the claimed invention to modify the thickness of insulating member of Chen, with the teaching of the insulating member of Takeshi, thereby providing an insulating layer, adequately dimension, so as to allow the arc to extend further in the arc movement portion between adjacent grids, increasing the arc voltage, and also allowing the arc to be interrupted in the arc movement portion, resulting in higher interruption performance. Regarding claim 5, Chan further discloses where a lowermost insulating member (3) among the plurality of grids (2) and insulating members (3) is disposed in surface contact with a lower surface of a lowermost grid (2), and the remaining insulating members (3) among the plurality of grids (2) and insulating members (3) are disposed in surface contact with upper surfaces of the remaining grids (2) Regarding claim 11, Chen fails to explicitly disclose wherein the first insulating member and the second insulating member are disposed to have a thickness smaller than that of the grid. Takeshi shows (fig.7), where a first insulating member (21) and a second insulating member (21) are disposed to have a thickness smaller than that of a conductor plate (19) of a grid (17). It would have been obvious to one of ordinary skill in the art before the effective filing date of the claimed invention to modify the thickness of insulating member of Chen, with the teaching of the insulating member of Takeshi, thereby providing an insulating layer, adequately dimension, so as to allow the arc to extend further in the arc movement portion between adjacent grids, increasing the arc voltage, and also allowing the arc to be interrupted in the arc movement portion, resulting in higher interruption performance. Regarding claim 15, Chen fails to explicitly disclose wherein a first insulator rear portion of the first insulating member and a second insulator rear portion of the second insulating member extend (protrude) from a rear portion of the grid. Takeshi discloses (clearly shown in fig.9c) where a first insulator rear portion of a first insulating member (21) and a second insulator rear portion of a second insulating member (21) extend (protrude) from a rear portion of a grid (17). It would have been obvious to one of ordinary skill in the art before the effective filing date of the claimed invention to modify the insulating member of Chen, with the teaching of the insulating member of Takeshi, thereby providing an insulating layer, design, so as to allow the arc to extend further in the arc movement portion between adjacent grids, increasing the arc voltage, and also allowing the arc to be interrupted in the arc movement portion, resulting in higher interruption performance. Conclusion The prior art made of record and not relied upon is considered pertinent to applicant's disclosure. Oh et al, Lim et al, Lee, Nahata et al, Kratzschmar, An, Bahlinger et al and Duggal et al are examples of arc extinguishing units of a molded case circuit breakers configured similar to the present invention. Any inquiry concerning this communication or earlier communications from the examiner should be directed to WILLIAM A BOLTON whose telephone number is (571)270-5887. The examiner can normally be reached Mon-Fri: 7:30AM - 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, Renee S Luebke can be reached at 571-272-2009. 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. /WILLIAM A BOLTON/Primary Examiner, Art Unit 2831
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Prosecution Timeline

Jul 10, 2024
Application Filed
Jul 22, 2026
Non-Final Rejection mailed — §102, §103 (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
89%
Grant Probability
95%
With Interview (+5.8%)
1y 10m (~0m remaining)
Median Time to Grant
Low
PTA Risk
Based on 766 resolved cases by this examiner. Grant probability derived from career allowance rate.

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