Prosecution Insights
Last updated: July 17, 2026
Application No. 18/815,101

FLUID DISTRIBUTOR FOR MICROCHANNEL HEAT EXCHANGER

Final Rejection §102
Filed
Aug 26, 2024
Priority
Aug 31, 2023 — provisional 63/535,943
Examiner
LING, FOR K.
Art Unit
3763
Tech Center
3700 — Mechanical Engineering & Manufacturing
Assignee
Carrier Corporation
OA Round
2 (Final)
54%
Grant Probability
Moderate
3-4
OA Rounds
1y 6m
Est. Remaining
73%
With Interview

Examiner Intelligence

Grants 54% of resolved cases
54%
Career Allowance Rate
240 granted / 447 resolved
-16.3% vs TC avg
Strong +19% interview lift
Without
With
+18.9%
Interview Lift
resolved cases with interview
Typical timeline
3y 4m
Avg Prosecution
29 currently pending
Career history
491
Total Applications
across all art units

Statute-Specific Performance

§103
84.0%
+44.0% vs TC avg
§102
10.3%
-29.7% vs TC avg
§112
5.4%
-34.6% vs TC avg
Black line = Tech Center average estimate • Based on career data from 447 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 . 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. Claim(s) 21 is/are rejected under 35 U.S.C. 102(a)(1) as being anticipated by Sasaki (JP 2018-162901 A). Regarding claim 21, Sasaki discloses a fluid distributor for a heat exchanger (Fig. 4), the fluid distributor comprising: a header (upstream header 3); a distribution tube (connecting pipe 5) extending longitudinally (extending vertically in Fig. 4); and a supply tube (inlet pipe 36) fluidically connected to a supply tube compartment (a gas-liquid mixing section 4) of the header and configured to supply a working fluid (refrigerant) into the distribution tube (into the connecting pipe 5 leading to compartments in the header 3), wherein the supply tube compartment comprises a baffle (perforated plate 43) having a plurality of openings (openings of the plate 43 shown in Figs. 4 and 5), and wherein the supply tube is connected radially to the supply tube compartment above the baffle (Fig. 5 shows that the inlet pipe 36 connects the gas-liquid mixing section 4 radially; and Fig. 4 shows that that the inlet pipe 36 connects the gas-liquid mixing section 4 above the perforated plate 43). Allowable Subject Matter Claims 1-19 are allowed. The following is an examiner' s statement of reasons for allowance: Amended claim 1 now requires, “wherein the supply tube compartment comprises a baffle having a plurality of openings, and the supply tube is connected radially to the supply tube compartment above the baffle. Jindou (Fig. 27) discloses the supply tube (liquid refrigerant pipe 35) is connected radially to the supply tube compartment (the liquid refrigerant pipe 35 is fluidly connected to compartment 76A through a center through hole 74m, paragraph 0172 of Jindou. The liquid refrigerant pipe 35 also has an elbow that extends radially outward from the compartment 76A) above the baffle (the liquid refrigerant pipe 35 is fluidly connected to compartment 76A above the baffle 77 between compartments 76A and 76B). However, Jindou fails to disclose and lacks motivation to make obvious to provide a plurality of openings in a baffle. A further reference, Leffler (US 2021/0262744), discloses a baffle (baffle 58 that separates the sections 81 and 82, Fig. 8) having a central opening (a central opening that allows the distributor 20 through) may include a plurality of openings (flow holes of the baffle 58. The baffle 58 can include flow holes therethrough, allowing for fluid to move between adjacent sections of the first manifold 54, see paragraph 0066). However, Leffler fails to discloses that the supply tube is connected radially to the supply tube compartment above the baffle. The feature disclosed in Fig. 27 of Jindou to use the center through hole 74m as a fluid supply channel is not combinable with Leffler to make the inner fluid passage 23 as a supply channel. It is because the inner fluid passage 23 is configured as a fluidly isolated channel from the remaining fluid passages 26 (paragraph 0068), or forming a fluid connection between the inner fluid passage 23 to one or more separate fluid channels 26 (paragraph 0069). It appears that the modification would render the prior art unsatisfactory for its intended purpose. A new reference Sasaki (JP 2018-162901 A) teaches the limitation wherein the supply tube compartment (4) comprises discloses comprises a baffle having a plurality of openings (43), and the supply tube (36) is connected radially to the supply tube compartment above the baffle (inlet 36 is radially connected to the section 4 above the plate 43). Sasaki further discloses that the perforated plate 43 separates gas refrigerant as the refrigerant passes through the plate 43 and moves above the gas-liquid interface 42 (paragraph 0048 of the translation). However, the diverting space 75 is disclosed in Jindou is disclosed as a guiding space and lacks a gas and liquid separation having the gas-liquid interface. Therefore, Sasaki teaches away from the disclosure of Jindou and the benefit of providing the plate 43 in Sasaki does not apply to the structure of Jindou. Sasaki itself also fails to disclose the details of the distribution tube having a plurality of cavities as set forth in claim 1. Response to Arguments Applicant’s arguments with respect to claim(s) 21 have been considered but are moot because the new ground of rejection does not rely on any reference applied in the prior rejection of record for any teaching or matter specifically challenged in the argument (the new reference Sasaki, JP 2018-162901 A). Conclusion Applicant's amendment necessitated the new ground(s) of rejection presented in this Office action. Accordingly, THIS ACTION IS MADE FINAL. See MPEP § 706.07(a). Applicant is reminded of the extension of time policy as set forth in 37 CFR 1.136(a). A shortened statutory period for reply to this final action is set to expire THREE MONTHS from the mailing date of this action. In the event a first reply is filed within TWO MONTHS of the mailing date of this final action and the advisory action is not mailed until after the end of the THREE-MONTH shortened statutory period, then the shortened statutory period will expire on the date the advisory action is mailed, and any nonprovisional extension fee (37 CFR 1.17(a)) pursuant to 37 CFR 1.136(a) will be calculated from the mailing date of the advisory action. In no event, however, will the statutory period for reply expire later than SIX MONTHS from the mailing date of this final action. Any inquiry concerning this communication or earlier communications from the examiner should be directed to FOR K LING whose telephone number is (571)272-8752. The examiner can normally be reached Monday through Friday, 8:30 am to 5 pm. 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, Jianying Atkisson can be reached at 571-270-7740. 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. /JIANYING C ATKISSON/Supervisory Patent Examiner, Art Unit 3763 /F.K.L/Examiner, Art Unit 3763
Read full office action

Prosecution Timeline

Aug 26, 2024
Application Filed
Jan 27, 2026
Non-Final Rejection mailed — §102
Apr 23, 2026
Response Filed
Jun 23, 2026
Final Rejection mailed — §102 (current)

Precedent Cases

Applications granted by this same examiner with similar technology

Patent 12680766
HEAT EXCHANGER AND METHOD FOR MANUFACTURING THE SAME
3y 3m to grant Granted Jul 14, 2026
Patent 12679167
VEHICLE
2y 1m to grant Granted Jul 14, 2026
Patent 12674602
Condensation Heat Exchanger
2y 5m to grant Granted Jul 07, 2026
Patent 12674623
HEAT EXCHANGE ASSEMBLY AND HEAT EXCHANGE SYSTEM
2y 2m to grant Granted Jul 07, 2026
Patent 12669293
VAPOR CHAMBER WITH SUPPORT STRUCTURE
3y 0m to grant Granted Jun 30, 2026
Study what changed to get past this examiner. Based on 5 most recent grants.

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Prosecution Projections

3-4
Expected OA Rounds
54%
Grant Probability
73%
With Interview (+18.9%)
3y 4m (~1y 6m remaining)
Median Time to Grant
Moderate
PTA Risk
Based on 447 resolved cases by this examiner. Grant probability derived from career allowance rate.

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