Prosecution Insights
Last updated: October 02, 2026
Application No. 18/752,073

HEAT EXCHANGER UNIT AND METHOD FOR MANUFACTURING THE SAME

Non-Final OA §102
Filed
Jun 24, 2024
Priority
Dec 30, 2019 — RE 10-2019-0178390 +2 more
Examiner
WILSON, GREGORY A
Art Unit
3762
Tech Center
3700 — Mechanical Engineering & Manufacturing
Assignee
Kyungdong Navien Co., Ltd.
OA Round
1 (Non-Final)
82%
Grant Probability
Favorable
1-2
OA Rounds
6m
Est. Remaining
89%
With Interview

Examiner Intelligence

Grants 82% — above average
82%
Career Allowance Rate
990 granted / 1210 resolved
+11.8% vs TC avg
Moderate +7% lift
Without
With
+6.9%
Interview Lift
resolved cases with interview
Typical timeline
2y 9m
Avg Prosecution
33 currently pending
Career history
1224
Total Applications
across all art units

Statute-Specific Performance

§101
0.6%
-39.4% vs TC avg
§103
35.9%
-4.1% vs TC avg
§102
39.3%
-0.7% vs TC avg
§112
22.0%
-18.0% vs TC avg
Black line = Tech Center average estimate • Based on career data from 1210 resolved cases

Office Action

§102
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 . Priority Receipt is acknowledged of certified copies of papers required by 37 CFR 1.55. Claim Objections Claim 4 is objected to because of the following informalities: Claim 4 includes redundant language “two combustion chamber heat insulation side plate portions spaced apart from each other in a left-right direction and configured to form an interior space of the combustion chamber together with the two general combustion chamber side plate portions”. Appropriate correction is required. 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. Claim(s) 1-3 and 6-12 is/are rejected under 35 U.S.C. 102(a)(1) as being anticipated by Choi et al (WO 2014098282). Choi et al discloses a heat exchanger unit (100) comprising: a combustion chamber (137) in which a flame caused by a combustion reaction is located; a heat exchanger (110) located under the combustion chamber (SEE Figure 3), the heat exchanger including heat exchange pipes (125) configured to receive heat generated by the combustion reaction and to heat water flowing through a heat exchanger flow passage (within the outer enclosure) formed therein and a main case (130) having the heat exchange pipes accommodated in an interior space thereof; a combustion chamber heat insulation pipe (140) disposed adjacent to the combustion chamber and configured to receive the water and allow the water to flow through a combustion chamber flow passage formed therein to thermally insulate the combustion chamber; and a connecting adaptor (150) configured to connect the heat exchanger flow passage and the combustion chamber flow passage (SEE Figure 3). In re claim 2, Choi et al discloses that the combustion chamber includes a combustion chamber supply hole (131) configured to serve as an inlet of the combustion chamber flow passage and connected with the connecting adaptor (SEE Figure 4). In re claim 3, Choi et al discloses that the combustion chamber supply hole (131) is fluidically connected with the combustion chamber heat insulation pipe (SEE element 153 in Figure 3). In re claim 6, Choi et al discloses that the combustion chamber heat insulation pipe(140) includes a plurality of combustion chamber heat insulation pipes (Figure 3), and wherein the combustion chamber heat insulation pipes are sequentially connected in series to form a combustion chamber flow passage (Figure 3 and paragraph [34]). In re claim 7, Choi et al discloses that the heat exchanger further includes a heating-water discharge hole (113) configured to serve as an outlet of the heat exchanger flow passage and connected with the connecting adaptor (Figure 4). In re claim 8, Choi et al discloses that the heating-water discharge hole (113) is fluidically connected with the heat exchange pipes (as per Figures 4-5). In re claim 9, Choil et al discloses that the heat exchanger further includes a flow passage cap plate (123) (SEE Figure 4) configured to fluidically connect straight portions (125) adjacent to each other among a plurality of straight portions configured to form the heat exchange pipes (125), and wherein the heat exchange pipes and the heating-water discharge hole are fluidically connected to the flow passage cap plate such that water delivered through the heat exchange pipes is delivered to the heating-water discharge hole (Figure 5). In re claim 10, Choi et al discloses that the heat exchanger flow passage is a sensible heat flow passage, and wherein the heat exchanger further includes: a sensible heat exchanger (120) located under the combustion chamber and configured to receive heat generated by the combustion reaction and to heat water flowing through a sensible heat flow passage formed therein (between the heat exchanger connection unit 120 and the casing 110), wherein the sensible heat exchanger includes a sensible heat exchange pipe being one of the heat exchange pipes and a sensible heat exchanger case configured to accommodate the sensible heat exchange pipe in an interior space (within the case 110) thereof and to form the main case; and a sensible heat insulation pipe (125) disposed adjacent to the sensible heat exchanger case and configured to receive the water and allow the water to flow through the sensible heat insulation pipe to thermally insulate the sensible heat exchanger. In re claim 11, Choi et al discloses that the sensible heat insulation pipe (125) is additionally fluidically connected to the sensible heat exchange pipe to form the sensible heat flow passage, and wherein the connecting adaptor (150) connects the combustion chamber heat insulation pipe (140) and the sensible heat insulation pipe (125). In re claim 12, Choi et al discloses that the heat exchanger further includes a flow passage cap plate (121, 123) including flow passage caps configured to fluidically connect straight portions adjacent to each other among a plurality of straight portions configured to form the sensible heat exchange pipe (Figure 5) or fluidically connect the sensible heat insulation pipe and an end portion of the sensible heat exchange pipe adjacent to the sensible heat insulation pipe, and wherein the sensible heat insulation pipe (125) and the heating-water discharge hole (113) are fluidically connected to the flow passage cap plate such that water delivered through the sensible heat insulation pipe is delivered to the heating-water discharge hole (SEE Figure 5). Claim(s) 1-4 and 6-9 is/are rejected under 35 U.S.C. 102(a)(1) as being anticipated by Shiotsu et al (10,890,356). Shiotsu et al discloses a heat exchanger unit (200) comprising: a combustion chamber (body part 13 is disposed close to a burner, this surrounding area is being interpreted as the combustion chamber, SEE column 2, lines 13-21) in which a flame caused by a combustion reaction is located; a heat exchanger (20) located under the combustion chamber (SEE Figure 2), the heat exchanger including heat exchange pipes (21) configured to receive heat generated by the combustion reaction and to heat water flowing through a heat exchanger flow passage (the area surrounding the heat exchanger pipes) formed therein and a main case (22) having the heat exchange pipes accommodated in an interior space thereof; a combustion chamber heat insulation pipe (131-133) disposed adjacent to the combustion chamber and configured to receive the water and allow the water to flow through a combustion chamber flow passage (area surrounding the pipes) formed therein to thermally insulate the combustion chamber; and a connecting adaptor (60) configured to connect the heat exchanger flow passage and the combustion chamber flow passage (SEE Figure 2). In re claim 2, Shiotsu et al discloses that the combustion chamber includes a combustion chamber supply hole (10a) configured to serve as an inlet of the combustion chamber flow passage and connected with the connecting adaptor (SEE Figures 2-3). In re claim 3, Shiotsu et al discloses that the combustion chamber supply hole is fluidically connected with the combustion chamber heat insulation pipe (Figure 2). In re claim 4, Shiotsu et al discloses that the combustion chamber heat insulation pipe includes a plurality of combustion chamber heat insulation pipes (131, 132, 133), wherein the combustion chamber includes: two general combustion chamber side plate portions (12) spaced apart from each other in a front-rear direction; two combustion chamber heat insulation side plate portions spaced apart from each other in a left-right direction and configured to form an interior space of the combustion chamber together with the two general combustion chamber side plate portions; and a combustion chamber flow passage cap plate (element 13 and its opposite side plate) including a combustion chamber flow passage cap (13) configured to form a connection space between the general combustion chamber side plate portions and the combustion chamber flow passage cap, wherein the connection space surrounds openings formed in end portions of the combustion chamber heat insulation pipes to fluidically connect the combustion chamber heat insulation pipes, and wherein the combustion chamber heat insulation pipe and the combustion chamber supply hole (10a) are fluidically connected to the combustion chamber flow passage cap (13) such that water delivered through the combustion chamber supply hole is delivered to the combustion chamber heat insulation pipe (131, as per Figure 2). In re claim 6, Shiotsu et al discloses that the combustion chamber heat insulation pipe includes a plurality of combustion chamber heat insulation pipes, and wherein the combustion chamber heat insulation pipes are sequentially connected in series to form a combustion chamber flow passage (SEE column 5, lines 13-15). In re claim 7, Shiotsu et al discloses that the heat exchanger further includes a heating-water discharge hole (20b) configured to serve as an outlet of the heat exchanger flow passage and connected with the connecting adaptor (60). In re claim 8, Shiotsu et al discloses that the heating-water discharge hole is fluidically connected with the heat exchange pipes (21) via (232). In re claim 9, Shiotsu et al discloses that the heat exchanger further includes a flow passage cap plate (22a, 22c) configured to fluidically connect straight portions (21c) adjacent to each other among a plurality of straight portions configured to form the heat exchange pipes, and wherein the heat exchange pipes and the heating-water discharge hole (20b) are fluidically connected to the flow passage cap plate (22a) such that water delivered through the heat exchange pipes is delivered to the heating-water discharge hole (SEE Figure 2). Allowable Subject Matter Claims 5 and 13-20 are objected to as being dependent upon a rejected base claim, but would be allowable if rewritten in independent form including all of the limitations of the base claim and any intervening claims. Any inquiry concerning this communication or earlier communications from the examiner should be directed to GREGORY A WILSON whose telephone number is (571)272-4882. The examiner can normally be reached M-F; 7:00am-4:30pm. 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, Helena Kosanovic can be reached at 571-272-9059. 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. /GREGORY A WILSON/ Primary Examiner, Art Unit 3762 August 8, 2026
Read full office action

Prosecution Timeline

Jun 24, 2024
Application Filed
Aug 11, 2026
Non-Final Rejection mailed — §102 (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
82%
Grant Probability
89%
With Interview (+6.9%)
2y 9m (~6m remaining)
Median Time to Grant
Low
PTA Risk
Based on 1210 resolved cases by this examiner. Grant probability derived from career allowance rate.

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