Prosecution Insights
Last updated: April 19, 2026
Application No. 18/565,708

NOVEL DIPHENAZINE COMPOUND, AND USE THEREOF FOR PREVENTING OR TREATING CANCER OR NEUROINFLAMMATORY DISEASES

Non-Final OA §101§112
Filed
Nov 30, 2023
Examiner
WHITE, DAWANNA SHAR-DAY
Art Unit
1627
Tech Center
1600 — Biotechnology & Organic Chemistry
Assignee
Korea Institute Of Ocean Science & Technology
OA Round
1 (Non-Final)
61%
Grant Probability
Moderate
1-2
OA Rounds
3y 9m
To Grant
92%
With Interview

Examiner Intelligence

Grants 61% of resolved cases
61%
Career Allow Rate
62 granted / 102 resolved
+0.8% vs TC avg
Strong +31% interview lift
Without
With
+30.8%
Interview Lift
resolved cases with interview
Typical timeline
3y 9m
Avg Prosecution
44 currently pending
Career history
146
Total Applications
across all art units

Statute-Specific Performance

§101
2.7%
-37.3% vs TC avg
§103
34.0%
-6.0% vs TC avg
§102
13.6%
-26.4% vs TC avg
§112
21.6%
-18.4% vs TC avg
Black line = Tech Center average estimate • Based on career data from 102 resolved cases

Office Action

§101 §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 . Claim Objections Claims 15 – 17 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. Claim Rejections - 35 USC § 112 The following is a quotation of the first paragraph of 35 U.S.C. 112(a): (a) IN GENERAL.—The specification shall contain a written description of the invention, and of the manner and process of making and using it, in such full, clear, concise, and exact terms as to enable any person skilled in the art to which it pertains, or with which it is most nearly connected, to make and use the same, and shall set forth the best mode contemplated by the inventor or joint inventor of carrying out the invention. The following is a quotation of the first paragraph of pre-AIA 35 U.S.C. 112: The specification shall contain a written description of the invention, and of the manner and process of making and using it, in such full, clear, concise, and exact terms as to enable any person skilled in the art to which it pertains, or with which it is most nearly connected, to make and use the same, and shall set forth the best mode contemplated by the inventor of carrying out his invention. Claim 6 is rejected under 35 U.S.C. § 112, first paragraph, as containing subject matter which was not described in the specification in such a way as to enable one skilled in the art to which it pertains, or with which it is most nearly connected, to make and/or use the invention. The invention appears to employ novel biological materials, specifically Cystobasidium laryngis IV17-028 KCTC 13720BP strain or a culture medium. Since the biological materials are essential to the claimed invention, they must be obtainable by a repeatable method set forth in the specification or otherwise readily available to the public. If the biological materials are not so obtainable or available, the requirements of 35 U.S.C. § 112 may be satisfied by a deposit of the biological materials. The specification does not disclose a repeatable process to obtain the biological materials, and it is not apparent if the biological materials are readily available to the public. It is noted that Applicant has deposited the biological materials (specification page 22 lines 14 – 15), but there is no indication in the specification as to public availability. If the deposit is made under the Budapest Treaty, then an affidavit or declaration by Applicant, or a statement by an attorney of record over his or her signature and registration number, stating that the specific biological materials have been deposited under the Budapest Treaty and that the biological materials will be irrevocably and without restriction or condition released to the public upon the issuance of a patent, would fully satisfy the deposit requirement. If the deposit has not been made under the Budapest Treaty, then in order to certify that the deposit meets the criteria set forth in 37 C.F.R. §§ 1.801-1.809, Applicant may provide assurance of compliance by an affidavit or declaration, or by a statement by an attorney of record over his or her signature and registration number, showing that: (a) during the pendency of this application, access to the invention will be afforded to the Commissioner upon request; (b) all restrictions upon availability to the public will be irrevocably removed upon granting of the patent; (c) the deposit must be maintained in a public depository for a period of 30 years or 5 years after the last request or for the effective life of the patent, whichever is longer; (d) a test of the viability of the biological material at the time of deposit will be made (see 37 C.F.R. §1.807) and (e) the deposit will be replaced if it should ever become inviable. Applicant' s attention is directed to M.P.E.P. § 2400 in general, and specifically to § 2411.05, as well as to 37 C.F.R. § 1.809(d), wherein it is set forth that “the specification shall contain the accession number for the deposit, the date of the deposit, the name and address of the depository, and a description of the deposited material sufficient to specifically identify it and to permit examination.” The specification should be amended to include this information; however, Applicant is cautioned to avoid entry of new matter into the specification by adding any other information. Applicant is advised that the address for the ATCC is: American Type Culture Collection 10801 University Boulevard Manassas, VA 20110-2209 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. Claims 3 and 4 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 applications subject to pre-AIA 35 U.S.C. 112, the applicant), regards as the invention. Regarding claim 3, the claim recites the diphenazine compound, the enantiomer thereof or the pharmaceutically acceptable salt thereof of claim 1, wherein X is PNG media_image1.png 6 3 media_image1.png Greyscale , and R1 is PNG media_image2.png 26 12 media_image2.png Greyscale , -COOH, or -COCH3. However, the structure of X as recited in instant claim 3 does not contain an R1 portion. Therefore, given that the structure does not contain R1 it is unclear which portion of the molecule R1 is defining. As a consequence, one of ordinary skill in the art would not be reasonably apprised of the scope of the invention. Specifically one of ordinary skill in the art would not be reasonably apprised of whether a diphenazine compound wherein X is PNG media_image1.png 6 3 media_image1.png Greyscale 1) requires R1 or not and 2) where R1 is located. Therefore, given the uncertainty around a diphenazine compound wherein X is PNG media_image1.png 6 3 media_image1.png Greyscale ; claim 3 is rejected under 35 U.S.C. 112(b). Nevertheless, for the sake of applying prior art the limitations from claim 1 wherein R2 and R3 are defined will be used. Regarding claim 4, the claim recites the diphenazine compound, the enantiomer thereof or the pharmaceutically acceptable salt thereof of claim 1, wherein X is PNG media_image1.png 6 3 media_image1.png Greyscale , and R1 is PNG media_image2.png 26 12 media_image2.png Greyscale , -COOH, or -COCH3. However, the structure of X as recited in instant claim 4 does not contain an R1 portion. Therefore, given that the structure does not contain R1 it is unclear which portion of the molecule R1 is defining. As a consequence, one of ordinary skill in the art would not be reasonably apprised of the scope of the invention. Specifically one of ordinary skill in the art would not be reasonably apprised of whether a diphenazine compound wherein X is PNG media_image1.png 6 3 media_image1.png Greyscale 1) requires R1 or not and 2) where R1 is located. Therefore, given the uncertainty around a diphenazine compound wherein X is PNG media_image1.png 6 3 media_image1.png Greyscale ; claim 4 is rejected under 35 U.S.C. 112(b). Nevertheless, for the sake of applying prior art the limitations from claim 1 wherein R4 are defined will be used. Claim Rejections - 35 USC § 101 35 U.S.C. 101 reads as follows: Whoever invents or discovers any new and useful process, machine, manufacture, or composition of matter, or any new and useful improvement thereof, may obtain a patent therefor, subject to the conditions and requirements of this title. Claims 1 – 8, and 11 – 12 are rejected under 35 U.S.C. 101 because the claimed invention is directed to a products of nature without significantly more. The claims recite the diphenazine compound of Chemical Formula 1 is isolated from a Cystobasidium laryngis IV17-028 KCTC 13720BP strain or a culture medium. This judicial exception is not integrated into a practical application because the claims direct to diphenazine compounds that are not markedly different from the diphenazine compounds produced by Cystobasidium laryngis IV17-028 KCTC 13720BP strain. The claims do not include additional elements that are sufficient to amount to significantly more than the judicial exception because the claims direct specifically to diphenazine compounds by structures. Discussion of the Prior Art The closet prior art of Laursen et. al. ((2004), Phenazine Natural Products: Biosynthesis, Synthetic Analogues, and Biological Activity, Chem. Rev., 104, 1663 – 1685) teach that saphenic acid-derived metabolites have diverging structures, including antibiotic activity in the mono-phenazine derivatives 28, 29, and 33 (Figure 4) and radical scavenging activity of the di-phenazines 30-32 of structures PNG media_image3.png 176 586 media_image3.png Greyscale (page 1668 Figure 4). However, Laursen et. al. fail to teach a diphenazine compound of Chemical Formula 1 below, an enantiomer thereof or a pharmaceutically acceptable salt thereof: PNG media_image1.png 6 3 media_image1.png Greyscale R1, R2, R3, and R4 are each independently PNG media_image4.png 200 400 media_image4.png Greyscale , -OH, -COH, -COOH, -COOCH3, or -COCH3 (claim 1). Specifically, Laursen et. al. fail to teach a diphenazine compound, which has the free carboxylic acid in combination with either the connectivity of X as recited, and the recited R1, R2, R3, and R4. Moreover, the prior art fails to provide motivation for modifying the prior art of Laursen et. al.. Given that the prior art of Laursen et. al. fails to anticipate o5r render obvious the compounds of the instant claims 1 – 8, and 11 – 12 are free of the prior art. Moreover, instant claims 15 – 17 that direct to a method of using the diphenazine compound of instant claim 1 are free of the prior art. Conclusion Claims 1 – 8, and 11 – 12 are rejected. Claims 15 – 17 are objected. Any inquiry concerning this communication or earlier communications from the examiner should be directed to DAWANNA S WHITE whose telephone number is (703)756-4687. The examiner can normally be reached 7:00 am - 5:00 pm [EST] M - Th. 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 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. /DAWANNA SHAR-DAY WHITE/Examiner, Art Unit 1627
Read full office action

Prosecution Timeline

Nov 30, 2023
Application Filed
Feb 11, 2026
Non-Final Rejection — §101, §112 (current)

Precedent Cases

Applications granted by this same examiner with similar technology

Patent 12600725
SELECTIVE GRP94 INHIBITORS AND USES THEREOF
2y 5m to grant Granted Apr 14, 2026
Patent 12582646
METHOD FOR TREATING DRUG OR ALCOHOL DEPENDENCY
2y 5m to grant Granted Mar 24, 2026
Patent 12582624
CO-CRYSTAL OF GABAPENTIN, KETOPROFEN AND LYSINE, PHARMACEUTICAL COMPOSITIONS AND THEIR MEDICAL USE
2y 5m to grant Granted Mar 24, 2026
Patent 12576015
ANTIMICROBIAL MIXTURE CONTAINING 4-(3-ETHOXY-4-HYDROXYPHENYL)BUTAN-2-ONE AND AN ALCOHOL COMPOUND, AND COSMETIC COMPOSITION CONTAINING SAME
2y 5m to grant Granted Mar 17, 2026
Patent 12569422
COMPOSITION AND METHOD OF INHIBITING CORTISONE REDUCTASE BY APPLYING IT TO THE SKIN
2y 5m to grant Granted Mar 10, 2026
Study what changed to get past this examiner. Based on 5 most recent grants.

AI Strategy Recommendation

Get an AI-powered prosecution strategy using examiner precedents, rejection analysis, and claim mapping.
Powered by AI — typically takes 5-10 seconds

Prosecution Projections

1-2
Expected OA Rounds
61%
Grant Probability
92%
With Interview (+30.8%)
3y 9m
Median Time to Grant
Low
PTA Risk
Based on 102 resolved cases by this examiner. Grant probability derived from career allow rate.

Sign in with your work email

Enter your email to receive a magic link. No password needed.

Personal email addresses (Gmail, Yahoo, etc.) are not accepted.

Free tier: 3 strategy analyses per month