Prosecution Insights
Last updated: October 01, 2026
Application No. 18/562,019

ACID DIANHYDRIDE

Non-Final OA §102§103§112
Filed
Nov 17, 2023
Priority
May 19, 2021 — JP 2021-084717 +1 more
Examiner
ONDACHI, PAULINE WANJIKU MUCH
Art Unit
Tech Center
Assignee
Mitsubishi Gas Chemical Company, Inc.
OA Round
1 (Non-Final)
100%
Grant Probability
Favorable
1-2
OA Rounds
0m
Est. Remaining
99%
With Interview

Examiner Intelligence

Grants 100% — above average
100%
Career Allowance Rate
1 granted / 1 resolved
+40.0% vs TC avg
Minimal +0% lift
Without
With
+0.0%
Interview Lift
resolved cases with interview
Typical timeline
2y 9m
Avg Prosecution
15 currently pending
Career history
5
Total Applications
across all art units

Statute-Specific Performance

§101
15.1%
-24.9% vs TC avg
§103
34.0%
-6.0% vs TC avg
§102
13.2%
-26.8% vs TC avg
§112
20.8%
-19.2% vs TC avg
Black line = Tech Center average estimate • Based on career data from 1 resolved cases

Office Action

§102 §103 §112
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 This Application is a 371 National Stage Entry of PCT/JP2022/009636, filed on March 7, 2022. Acknowledgment is made of applicant’s claim for foreign priority under 35 U.S.C. 119 (a)-(d). The certified copy has been filed in parent Application No. JP2021-084717, filed on May 19, 2021. Information Disclosure Statement The information disclosure statement (IDS) submitted on December 8, 2023 is acknowledged and has been considered. Status of the Claims Acknowledgement is made of the claims previously presented in the filed Application 18/562,019; 1-4, 6-7 (Original); 5, 8 – 9 (Amended); 10 -11 (New), claims filed on November 17, 2023. No new matter was added. Claims 1-11 are pending in the instant application; claims 3-11 are withdrawn. Thus, claims 1 and 2 are currently under examination. Election/Restrictions Applicant’s election without traverse of Group I (claims 1 and 2) in the reply filed on June 29, 2026 is acknowledged. Claims 3-11 are withdrawn from further consideration pursuant to 37 CFR 1.142(b) as being drawn to a nonelected invention, Group II, there being no allowable generic or linking claim. Election was made without traverse in the reply filed on June 29, 2026. Claims 1 and 2 are presently under consideration. Claim Objections Claims1 and 2 are objected to because of the following informalities: In claim 1, Applicant has indicated three periods between the displayed structure and the number (1); …(1) Similarly in claim 2, applicant has indicated; ….(2) Applicant is notified that per MPEP 608.01(m), each claim begins with a capital letter and ends with a period. Periods may not be used elsewhere in the claims except for abbreviations. In claim 1, applicant ends the following sentence with period at the end of the word structure; and A represents the following structure. (emphasis added). Applicant then shows two structures after the period. It appears, the period after the word structure, should be changed to a semi colon, assuming that the two structures are part of the afore mention sentence. Appropriate correction is required. 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 1 is 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 applications subject to pre-AIA 35 U.S.C. 112, the applicant), regards as the invention. Applicant recites the following, “…and A represents the following structure.” (emphasis added); PNG media_image1.png 65 152 media_image1.png Greyscale The phrase “A represents the following structure”, stated in singular form, renders the claim indefinite because two structures are shown without specifying the relationship between them. For example, it is unclear whether A represents either structure or another intended relationship. Applicant is requested to amend the claim to include appropriate transitional language or other clarifying language to clearly define A, and thus make definite the intended scope of the claimed invention. Claim interpretation: For the purpose of compact prosecution, Examiner assumes the transition phrase “OR”; such that, A represents either of the two structures shown. 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 1 is rejected under 35 U.S.C. 102 (a)(1) as being anticipated by Goshima and Win, 2019, (Goshima, T. and Win, M. S., “Diamine compound and polyimide compound and molded product using the same”, US 2019/0389795-A1, Published on December 26, 2019; Priority date, January 27, 2017: cited in prior PTO-897), hereon after, Goshima. Regarding instant claim 1, Goshima’s prior art teaches a polyimide compound that is a product of a reaction between a diamine and an acid anhydride of the genus, Chem. 5, general formula (9) (page 2). PNG media_image2.png 248 648 media_image2.png Greyscale Goshima teaches L1 represents a linking group selected from several linking groups revealed in the reference. Goshima further teaches L1 can represent the linking group, shown below, where R21 to R30 are each independently selected from a group consisting of a hydrogen atom, among others, and * represents the binding position ([0029], [0032] and [0033], page 3). Goshima discloses examples of acid anhydrides and that include the structure in the instant claimed invention as shown below ([0078], [0091], [0098] and claim 9). PNG media_image3.png 360 426 media_image3.png Greyscale Goshima’s Linking group – page 3 PNG media_image4.png 203 484 media_image4.png Greyscale Goshima’s Example - Page 9 and claim 9 Goshima’s linking group and example is identical to the instant application’s, PNG media_image5.png 56 56 media_image5.png Greyscale (instant claim 1). Thus, Goshima’s prior art, anticipates one of the claimed structures in the instant claim 1. 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. The factual inquiries 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. 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 and 2 are rejected under 35 U.S.C. 103 as being unpatentable over Goshima and Win, 2019, (Goshima, T. and Win, M. S., “Diamine compound and polyimide compound and molded product using the same”, US 2019/0389795-A1, Published December 26, 2019, Priority date, January 27, 2017, cited in prior PTO-897), hereon after Goshima, in view of Wang et al., 2004 (Wang et al., “Laminate for substrate of printed wiring board” US 2004/0038054 A1, Published on February 26, 2004) hereon after, Wang. Regarding instant claim 1, The teachings of Goshima as set forth in the above 35 U.S.C. 102 Rejections are incorporated herein. Goshima’s teachings on synthesis of polyimides from a diamine and acid anhydrides, reveal that the acid anhydride used can be either phthalic anhydride or hydrogenated phthalic anhydride ([0113]). The reference teaches the genus of the general formula(e) (8) and/or (9) derived from phthalic anhydride (Chem. 17 /(8)), or hydrogenated phthalic anhydride (Chem 18/ (9)), respectively ([0081], page 7). PNG media_image6.png 496 655 media_image6.png Greyscale From Goshima’s teachings the linking group L1 can be used interchangeably either of the general formula(e) (8) or (9) ([0099] and claim 8). For example, Goshima exemplifies the two compounds shown below with a similar linking group used in either of the two genus, phthalic anhydride or hydrogenated phthalic anhydride (page 9 and 16). Goshima, 2019 PNG media_image7.png 203 484 media_image7.png Greyscale Page 9 PNG media_image8.png 309 645 media_image8.png Greyscale Page 16 How prior art differs from instant claimed invention: Goshima does not teach a structure with a linking group comprising of, PNG media_image9.png 59 82 media_image9.png Greyscale as in the instant claimed invention, (instant claim 1, second structure, and instant claim 2). However, Wang’s disclosure, drawn towards compounds used in insulating polyimide resin layers discloses acid anhydrides derived from phthalic anhydride; From Wang’s prior art compound BPAP-TME, 1,3-dihydro-1,3-dioxo-5-isobenzofurancarboxylic acid (1-phenylethylidene)-di-4,1-phenylene ester is known ([0058], page 4). [(Cas No. 69577-61-3; Structure and Cas number from SciFinder). PNG media_image10.png 264 536 media_image10.png Greyscale Wang’s disclosed compound has the linking group, -C(C6H5)(CH3)- which is identical to PNG media_image9.png 59 82 media_image9.png Greyscale as in instant claimed invention. From the discussions above on Goshima’s prior art, Goshima teaches linking groups can be interchanged between the genus of a phthalic anhydride or the genus of a hydrogenated phthalic anhydride. Therefore, it would have been obvious for one of ordinary skill in the art before the effective filing date of the claimed invention to use Goshima genus of a hydrogenated phthalic anhydride and Wang linking group, -C(C6H5)(CH3)-, to arrive at the claimed invention, as in instant claim 1, second structure and instant claim 2, with reasonable expectation of success. Per MPEP § 2134(I)(A), a prima facie case of obviousness exists for combining prior art elements according to known methods to yield predictable results. The prior art from Goshima teaches acid dianhydrides from either phthalic anhydride or hydrogenated phthalic anhydride. Goshima teaches a linking group can be used interchangeably between either genus of phthalic anhydride or hydrogenated phthalic anhydride; Wang teaches the linking group, -C(CH3)(C6H5)-. Thus, it would have been obvious to one of ordinary skill in the art to apply Wang’s linking group to the genus of hydrogenated phthalic anhydride to arrive at an acid dianhydride as in the instant claimed invention. One would have been motivated to do so because Goshima’s prior art is drawn towards the synthesis of a polyimide compound using acid anhydrides and an amine. Similarly, Wang’s prior art is towards synthesis of polyimide resin using acid anhydrides and amines. Likewise the instant claimed invention is drawn towards acid anhydride and further, polyamic and polyimide derived from the acid dianhydride. Additionally, Goshima reveals similar linking groups can be used in hydrogenated diacid anhydrides as in the instant claims. As such, the available prior art is drawn towards the same field of invention as the instant claimed invention and it anticipates, suggests and render obvious the linking groups in the claimed invention; one of ordinary skill would have been motivated to combine the known prior art elements according to known methods to arrive at predictable and/or improved results. Conclusion Claims 1 and 2 are rejected. Communication Any inquiry concerning this communication or earlier communications from the examiner should be directed to PAULINE ONDACHI whose telephone number is (571)272-9419. The examiner can normally be reached Mon - Fri 8:00 am - 5:00 pm EST. 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, Kortney L. Klinkel can be reached at (571)270-5239. 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. /P.O./Examiner, Art Unit 1627 /Kortney L. Klinkel/Supervisory Patent Examiner, Art Unit 1627
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Prosecution Timeline

Nov 17, 2023
Application Filed
Aug 10, 2026
Non-Final Rejection mailed — §102, §103, §112 (current)

Precedent Cases

Applications granted by this same examiner with similar technology

Patent 12723017
2,5,6-TRICHLORODOPAMINE: SYNTHESIS AND APPLICATIONS
2y 8m to grant Granted Sep 01, 2026
Study what changed to get past this examiner. Based on 1 most recent grants.

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Prosecution Projections

1-2
Expected OA Rounds
100%
Grant Probability
99%
With Interview (+0.0%)
2y 9m (~0m remaining)
Median Time to Grant
Low
PTA Risk
Based on 1 resolved cases by this examiner. Grant probability derived from career allowance rate.

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