Prosecution Insights
Last updated: October 25, 2026
Application No. 19/234,216

REFRIGERATING SYSTEM USING NON-AZEOTROPIC MIXED REFRIGERANT

Non-Final OA §103§112§DOUBLEPATENT
Filed
Jun 10, 2025
Priority
Aug 21, 2019 — RE 10-2019-0102341 +2 more
Examiner
NOUKETCHA, LIONEL W
Art Unit
3763
Tech Center
3700 — Mechanical Engineering & Manufacturing
Assignee
LG Electronics Inc.
OA Round
1 (Non-Final)
81%
Grant Probability
Favorable
1-2
OA Rounds
1y 0m
Est. Remaining
94%
With Interview

Examiner Intelligence

Grants 81% — above average
81%
Career Allowance Rate
486 granted / 600 resolved
+11.0% vs TC avg
Moderate +13% lift
Without
With
+13.4%
Interview Lift
resolved cases with interview
Typical timeline
2y 5m
Avg Prosecution
39 currently pending
Career history
635
Total Applications
across all art units

Statute-Specific Performance

§101
0.2%
-39.8% vs TC avg
§103
41.6%
+1.6% vs TC avg
§102
21.1%
-18.9% vs TC avg
§112
35.0%
-5.0% vs TC avg
Black line = Tech Center average estimate • Based on career data from 600 resolved cases

Office Action

§103 §112 §DOUBLEPATENT
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 Interpretation The following is a quotation of 35 U.S.C. 112(f): (f) Element in Claim for a Combination. – An element in a claim for a combination may be expressed as a means or step for performing a specified function without the recital of structure, material, or acts in support thereof, and such claim shall be construed to cover the corresponding structure, material, or acts described in the specification and equivalents thereof. The following is a quotation of pre-AIA 35 U.S.C. 112, sixth paragraph: An element in a claim for a combination may be expressed as a means or step for performing a specified function without the recital of structure, material, or acts in support thereof, and such claim shall be construed to cover the corresponding structure, material, or acts described in the specification and equivalents thereof. The claims in this application are given their broadest reasonable interpretation using the plain meaning of the claim language in light of the specification as it would be understood by one of ordinary skill in the art. The broadest reasonable interpretation of a claim element (also commonly referred to as a claim limitation) is limited by the description in the specification when 35 U.S.C. 112(f) or pre-AIA 35 U.S.C. 112, sixth paragraph, is invoked. As explained in MPEP § 2181, subsection I, claim limitations that meet the following three-prong test will be interpreted under 35 U.S.C. 112(f) or pre-AIA 35 U.S.C. 112, sixth paragraph: (A) the claim limitation uses the term “means” or “step” or a term used as a substitute for “means” that is a generic placeholder (also called a nonce term or a non-structural term having no specific structural meaning) for performing the claimed function; (B) the term “means” or “step” or the generic placeholder is modified by functional language, typically, but not always linked by the transition word “for” (e.g., “means for”) or another linking word or phrase, such as “configured to” or “so that”; and (C) the term “means” or “step” or the generic placeholder is not modified by sufficient structure, material, or acts for performing the claimed function. Use of the word “means” (or “step”) in a claim with functional language creates a rebuttable presumption that the claim limitation is to be treated in accordance with 35 U.S.C. 112(f) or pre-AIA 35 U.S.C. 112, sixth paragraph. The presumption that the claim limitation is interpreted under 35 U.S.C. 112(f) or pre-AIA 35 U.S.C. 112, sixth paragraph, is rebutted when the claim limitation recites sufficient structure, material, or acts to entirely perform the recited function. Absence of the word “means” (or “step”) in a claim creates a rebuttable presumption that the claim limitation is not to be treated in accordance with 35 U.S.C. 112(f) or pre-AIA 35 U.S.C. 112, sixth paragraph. The presumption that the claim limitation is not interpreted under 35 U.S.C. 112(f) or pre-AIA 35 U.S.C. 112, sixth paragraph, is rebutted when the claim limitation recites function without reciting sufficient structure, material or acts to entirely perform the recited function. Claim limitations in this application that use the word “means” (or “step”) are being interpreted under 35 U.S.C. 112(f) or pre-AIA 35 U.S.C. 112, sixth paragraph, except as otherwise indicated in an Office action. Conversely, claim limitations in this application that do not use the word “means” (or “step”) are not being interpreted under 35 U.S.C. 112(f) or pre-AIA 35 U.S.C. 112, sixth paragraph, except as otherwise indicated in an Office action. This application includes one or more claim limitations that do not use the word “means,” but are nonetheless being interpreted under 35 U.S.C. 112(f) or pre-AIA 35 U.S.C. 112, sixth paragraph, because the claim limitation(s) uses a generic placeholder that is coupled with functional language without reciting sufficient structure to perform the recited function and the generic placeholder is not preceded by a structural modifier. Such claim limitation(s) is/are: a. expander in at least claim 8. Because this/these claim limitation(s) is/are being interpreted under 35 U.S.C. 112(f) or pre-AIA 35 U.S.C. 112, sixth paragraph, it/they is/are being interpreted to cover the corresponding structure described in the specification as performing the claimed function, and equivalents thereof. expander is interpreted to cover capillary tube as per [0112] of applicant specification; and equivalents thereof. If applicant does not intend to have this/these limitation(s) interpreted under 35 U.S.C. 112(f) or pre-AIA 35 U.S.C. 112, sixth paragraph, applicant may: (1) amend the claim limitation(s) to avoid it/them being interpreted under 35 U.S.C. 112(f) or pre-AIA 35 U.S.C. 112, sixth paragraph (e.g., by reciting sufficient structure to perform the claimed function); or (2) present a sufficient showing that the claim limitation(s) recite(s) sufficient structure to perform the claimed function so as to avoid it/them being interpreted under 35 U.S.C. 112(f) or pre-AIA 35 U.S.C. 112, sixth paragraph. 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. The following is a quotation of 35 U.S.C. 112 (pre-AIA ), second paragraph: The specification shall conclude with one or more claims particularly pointing out and distinctly claiming the subject matter which the applicant regards as his invention. Claim(s) 1-7 is/are rejected under 35 U.S.C. 112(b) or 35 U.S.C. 112 (pre-AIA ), second paragraph, as being indefinite for failing to particularly point out and distinctly claim the subject matter which the inventor or a joint inventor, or for pre-AIA the applicant regards as the invention. Claim 1 calls for the limitation “at least one gas-liquid separator disposed at the compressor suction pipe, the gas-liquid separator being not disposed…” (last paragraph), which limitation is indefinite as it is unclear as to how the gas-liquid separator relates to the previously recited at least one gas-liquid separator. In other words, is the gas-liquid separator one of at least one gas-liquid separator? Or is it the same as the at least one gas-liquid separator? It is uncertain. Applicant is encouraged to recite “at least one gas-liquid separator disposed at the compressor suction pipe, the at least one gas-liquid separator being not disposed…” A similar issue is found in claim 2 with the recitation “the gas-liquid separator”. Claim 2 should be addressed accordingly. Claim 3 calls for the limitation “a temperature of the non-azeotropic mixed refrigerant flowing through the respective capillary tube is lower than a temperature of the non-azeotropic mixed refrigerant flowing through the compressor suction pipe”; which limitation recites both an apparatus and the method steps of using the apparatus. It is unclear whether infringement occurs when one creates the apparatus or when one actually uses the apparatus (see MPEP 2173.05(p), In re Katz Interactive Call Processing Patent Litigation, 639 F.3d 1303, 1318, 97 USPQ2d 1737, 1748-49 (Fed. Cir. 2011). A similar issue is found in claims 9 and 10. Appropriate correction is required. Claims 2-7 and 11 are indefinite for their dependency on an indefinite base claim. 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 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. The factual inquiries set forth in Graham v. John Deere Co., 383 U.S. 1, 148 USPQ 459 (1966), that are applied for establishing a background for determining obviousness under 35 U.S.C. 103 are summarized as follows: 1. Determining the scope and contents of the prior art. 2. Ascertaining the differences between the prior art and the claims at issue. 3. Resolving the level of ordinary skill in the pertinent art. 4. Considering objective evidence present in the application indicating obviousness or nonobviousness. Claim(s) 1-2 and 6-7 is/are rejected under 35 U.S.C. 103 as being unpatentable over Park (US 20190024948 A1) in view of Matsunaga (US 7739881 B2). Regarding claim 1: Park discloses a refrigerating apparatus (Fig. 7), comprising: a compressor #110 to compress a non-azeotropic mixed refrigerant ([0011]); a condenser #120 to condense the compressed non-azeotropic mixed refrigerant; at least two evaporators including a first evaporator #151a configured to supply cold air to a first interior space, and a second evaporator #152a configured to supply cold air to a second interior space at a temperature higher than a temperature of the first interior space ([0155]); a valve #170 configured to branch the non-azeotropic mixed refrigerant condensed by the condenser to at least two branches; at least two capillary tubes including a first capillary tube #141 configured to connect the valve to a refrigerant inlet side of the first evaporator, and a second capillary tube #143 configured to connect the valve to a refrigerant inlet side of the second evaporator (Fig. 7); a compressor suction pipe #165 to connect the refrigerant outlet side of the second evaporator to an inlet side of the compressor; a regenerative heat exchanger #250a in which at least a portion of the at least two capillary tubes is adjacent to the compressor suction pipe to exchange heat therebetween (Fig. 7), check valve #158 to allow the non-azeotropic mixed refrigerant to flow from the first evaporator to the second evaporator (Fig. 7). Park does not disclose at least one gas-liquid separator disposed at the compressor suction pipe, the gas-liquid separator being not disposed in a connection pipe between the first evaporator and the second evaporator. In the same field of endeavor, Matsunaga teaches wherein at least one gas-liquid separator #6 disposed at a compressor suction pipe #3b, the at least one gas-liquid separator being not disposed in a connection pipe between a first evaporator #8 and the second evaporator #9 (see Fig. 1B; col. 5, L 1-7). Thus, it would have been obvious for one of ordinary skills in the art before the effective filing date to have provided the apparatus of Park with at least one gas-liquid separator disposed at the compressor suction pipe, the gas-liquid separator being not disposed in a connection pipe between the first evaporator and the second evaporator; in a similar manner as taught by Matsunaga. One of ordinary skills would have recognized that doing so would have prevented liquid refrigerant from being sucked into the compressor; thereby, ensuring proper compressor operations. Regarding claim 2: Park as modified discloses all the limitations. As modified, the at least one gas-liquid separator is provided at the outlet side of the second evaporator (see rejection of claim 1 above). Regarding claim 6: Park as modified discloses all the limitations. Park further discloses wherein the check valve does not allow refrigerant flow from the second evaporator to the first evaporator such that a reverse flow of the refrigerant is prevented when switching from simultaneous operation of the first interior space and the second interior space to operation of the second interior space alone ([0152]). Regarding claim 7: Park as modified discloses all the limitations. Park further discloses wherein the first interior space is a freezer compartment and the second interior space is a refrigerating compartment ([0155]). Double Patenting The nonstatutory double patenting rejection is based on a judicially created doctrine grounded in public policy (a policy reflected in the statute) so as to prevent the unjustified or improper timewise extension of the “right to exclude” granted by a patent and to prevent possible harassment by multiple assignees. A nonstatutory double patenting rejection is appropriate where the conflicting claims are not identical, but at least one examined application claim is not patentably distinct from the reference claim(s) because the examined application claim is either anticipated by, or would have been obvious over, the reference claim(s). See, e.g., In re Berg, 140 F.3d 1428, 46 USPQ2d 1226 (Fed. Cir. 1998); In re Goodman, 11 F.3d 1046, 29 USPQ2d 2010 (Fed. Cir. 1993); In re Longi, 759 F.2d 887, 225 USPQ 645 (Fed. Cir. 1985); In re Van Ornum, 686 F.2d 937, 214 USPQ 761 (CCPA 1982); In re Vogel, 422 F.2d 438, 164 USPQ 619 (CCPA 1970); In re Thorington, 418 F.2d 528, 163 USPQ 644 (CCPA 1969). A timely filed terminal disclaimer in compliance with 37 CFR 1.321(c) or 1.321(d) may be used to overcome an actual or provisional rejection based on nonstatutory double patenting provided the reference application or patent either is shown to be commonly owned with the examined application, or claims an invention made as a result of activities undertaken within the scope of a joint research agreement. See MPEP § 717.02 for applications subject to examination under the first inventor to file provisions of the AIA as explained in MPEP § 2159. See MPEP § 2146 et seq. for applications not subject to examination under the first inventor to file provisions of the AIA . A terminal disclaimer must be signed in compliance with 37 CFR 1.321(b). The USPTO Internet website contains terminal disclaimer forms which may be used. Please visit www.uspto.gov/patent/patents-forms. The filing date of the application in which the form is filed determines what form (e.g., PTO/SB/25, PTO/SB/26, PTO/AIA /25, or PTO/AIA /26) should be used. A web-based eTerminal Disclaimer may be filled out completely online using web-screens. An eTerminal Disclaimer that meets all requirements is auto-processed and approved immediately upon submission. For more information about eTerminal Disclaimers, refer to www.uspto.gov/patents/process/file/efs/guidance/eTD-info-I.jsp. Claims 8 and 11 are respectively rejected on the ground of nonstatutory double patenting as being unpatentable over claim 1 and 11 of U.S. Patent No. 12331975. Although the terminology, phrasing, or specific claim terms differ, the underlying invention or functional scope is the same or an obvious variation. Allowable Subject Matter Claims 8, 12-20 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. The following is a statement of reasons for the indication of allowable subject matter: The combination of elements as set forth in independent claims 8 and 17 is not disclosed or made obvious by the prior art of record. Conclusion The prior art made of record and not relied upon is considered pertinent to applicant's disclosure. Yoon (US 20070068193 A1), Bonet (US 9310121 B2), Itoh (US 20070193292 A1), Rivis (US 20150096325 A1). Any inquiry concerning this communication or earlier communications from the examiner should be directed to LIONEL W NOUKETCHA whose telephone number is (571)272-8438. The examiner can normally be reached on Mon - Fri: 08:00 AM - 04:00 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, Frantz Jules can be reached on 571-272-6681. 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. /LIONEL NOUKETCHA/Primary Examiner, Art Unit 3763
Read full office action

Prosecution Timeline

Jun 10, 2025
Application Filed
Jul 22, 2025
Response after Non-Final Action
Oct 16, 2026
Non-Final Rejection mailed — §103, §112, §DOUBLEPATENT (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
81%
Grant Probability
94%
With Interview (+13.4%)
2y 5m (~1y 0m remaining)
Median Time to Grant
Low
PTA Risk
Based on 600 resolved cases by this examiner. Grant probability derived from career allowance rate.

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