Prosecution Insights
Last updated: April 19, 2026
Application No. 18/519,533

COMPOUNDS AND USES THEREOF

Non-Final OA §DP
Filed
Nov 27, 2023
Examiner
COUGHLIN, MATTHEW P
Art Unit
1626
Tech Center
1600 — Biotechnology & Organic Chemistry
Assignee
Foghorn Therapeutics Inc.
OA Round
1 (Non-Final)
71%
Grant Probability
Favorable
1-2
OA Rounds
2y 5m
To Grant
84%
With Interview

Examiner Intelligence

Grants 71% — above average
71%
Career Allow Rate
702 granted / 984 resolved
+11.3% vs TC avg
Moderate +12% lift
Without
With
+12.2%
Interview Lift
resolved cases with interview
Typical timeline
2y 5m
Avg Prosecution
48 currently pending
Career history
1032
Total Applications
across all art units

Statute-Specific Performance

§101
1.7%
-38.3% vs TC avg
§103
24.9%
-15.1% vs TC avg
§102
20.4%
-19.6% vs TC avg
§112
30.3%
-9.7% vs TC avg
Black line = Tech Center average estimate • Based on career data from 984 resolved cases

Office Action

§DP
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 . DETAILED ACTION Claims 1 and 2 are pending in the application. Claims 1 and 2 are rejected. Information Disclosure Statement The Examiner has considered the Information Disclosure Statement(s) filed on February 8th, 2024. Priority The instant claims are supported by U.S. Provisional Application No. 62/967,524 and therefore have an earliest effective filing date of January 29th, 2020. WO 2020/160192 A2 by Brucelle et al. (which claims priority to U.S. Provisional Application No. 62/881,163 filed July 31st, 2019) is cited below in double patenting rejections and is available under 35 USC 102(a)(2) until a disqualifying statement is made in the instant application. 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. (1 of 9) Claims 1 and 2 are rejected on the ground of nonstatutory double patenting as being unpatentable over claims 1-6 of U.S. Patent No. 11,851,445. Although the claims at issue are not identical, they are not patentably distinct from each other because claim 1 of the patent as issued recites a compound of formula D2 as recited in instant claim 1. Regarding instant claim 2, a person having ordinary skill in the art would have been motivated to add a pharmaceutically acceptable excipient for ease of administration and where claims 4-6 of the patent recite pharmaceutical compositions for the analogous compound D1 of the patent. (2 of 9) Claims 1 and 2 are rejected on the ground of nonstatutory double patenting as being unpatentable over claims 1-6 of U.S. Patent No. 11,851,445 in view of WO 2020/160192 A1 by Brucelle et al. and in further view of Kaur et al. Global Journal of Pharmacy & Pharmaceutical Science, 2017, 1(4): GJPPS.MS.ID.555566. Claim 1 of the patent recites compound D1 having the following structure: PNG media_image1.png 319 736 media_image1.png Greyscale . The compound has the same backbone structure as instant compound D2 except where the methoxy groups are deuterium enriched. The patent provides the following definitions in column 12: PNG media_image2.png 226 578 media_image2.png Greyscale Accordingly, even if claim 1 of the patent were subject to a certificate of correction to delete reference to compound D2, the claims of the patent would still be generic to the compound D2 as instantly claimed. Furthermore, a person having ordinary skill in the art would have been familiar with permissible deuterium labeling at the analogous positions. Brucelle et al. teach compounds of the following general formula (page 1, support can be found in claim 1 of U.S. Provisional Application No. 62/881,163): PNG media_image3.png 219 219 media_image3.png Greyscale where G can be the following structure on page 7 (support can be found in claim 25 of the provisional application): PNG media_image4.png 219 216 media_image4.png Greyscale . Brucelle et al. further teach the following definitions for RG1-RG5 on page 8 (support can be found in claim 27 of the provisional application): PNG media_image5.png 241 714 media_image5.png Greyscale Brucelle et al. teach the use of both -OCH3 and -OC(2H)3. A person having ordinary skill in the art would have reasonably expected the instantly claimed compound to have similar utility as the non-enriched compound (as depicted in the claims of the patent) and in view of the teachings of Brucelle et al. would have been motivated to prepare the instantly claimed deuterium labeled compound to test for any metabolic improvements. For instance, Kaur et al. teach in the abstract “Deuteration is an effective tool for the enhancement of drug’s metabolic profile.” Regarding instant claim 2, a person having ordinary skill in the art in seeking to test the instantly claimed compound’s utility would have been motivated to prepare analogous compositions to those recited in claim 4 of the patent. (3 of 9) Claims 1 and 2 are rejected on the ground of nonstatutory double patenting as being unpatentable over claims 1-12 of U.S. Patent No. 11,767,330 in view of WO 2020/160192 A1 by Brucelle et al. and in further view of Kaur et al. Global Journal of Pharmacy & Pharmaceutical Science, 2017, 1(4): GJPPS.MS.ID.555566. Claim 1 of the patent recites a citrate salt of a compound having the following structure: PNG media_image6.png 231 446 media_image6.png Greyscale . The compound has the same backbone structure as instant compound D2 except where the methoxy groups are deuterium enriched. The patent provides the following definitions in column 111: PNG media_image7.png 169 486 media_image7.png Greyscale Accordingly, the claims of the patent are generic to the compound D2 as instantly claimed. Furthermore, a person having ordinary skill in the art would have been familiar with permissible deuterium labeling at the analogous positions. Brucelle et al. teach compounds of the following general formula (page 1, support can be found in claim 1 of U.S. Provisional Application No. 62/881,163): PNG media_image3.png 219 219 media_image3.png Greyscale where G can be the following structure on page 7 (support can be found in claim 25 of the provisional application): PNG media_image4.png 219 216 media_image4.png Greyscale . Brucelle et al. further teach the following definitions for RG1-RG5 on page 8 (support can be found in claim 27 of the provisional application): PNG media_image5.png 241 714 media_image5.png Greyscale Brucelle et al. teach the use of both -OCH3 and -OC(2H)3. A person having ordinary skill in the art would have reasonably expected the instantly claimed compound to have similar utility as the non-enriched compound (as depicted in the claims of the patent) and in view of the teachings of Brucelle et al. would have been motivated to prepare the instantly claimed deuterium labeled compound to test for any metabolic improvements. For instance, Kaur et al. teach in the abstract “Deuteration is an effective tool for the enhancement of drug’s metabolic profile.” Regarding instant claim 2, a person having ordinary skill in the art in seeking to test the instantly claimed compound’s utility would have been motivated to prepare analogous compositions to those recited in claims 2-10 of the patent. (4 of 9) Claims 1 and 2 are provisionally rejected on the ground of nonstatutory double patenting as being unpatentable over claims 1-20 of copending Application No. 18/223,443 (reference application). Although the claims at issue are not identical, they are not patentably distinct from each other because claim 2 of the copending case recites a citrate salt of a compound embraced by instant compound D2. Regarding instant claim 2, a person having ordinary skill in the art in seeking to test the instantly claimed compound’s utility would have been motivated to prepare analogous compositions to those recited in claims 3-12 of the copending case. This is a provisional nonstatutory double patenting rejection because the patentably indistinct claims have not in fact been patented. (5 of 9) Claims 1 and 2 are provisionally rejected on the ground of nonstatutory double patenting as being unpatentable over claims 1-3, 5-9, 11-15, 19, 20 and 25-29 of copending Application No. 18/292,426 in view of WO 2020/160192 A1 by Brucelle et al. and in further view of Kaur et al. Global Journal of Pharmacy & Pharmaceutical Science, 2017, 1(4): GJPPS.MS.ID.555566. Claim 1 of the copending case recites a method of using a compound having the following structure: PNG media_image8.png 189 361 media_image8.png Greyscale . The compound has the same backbone structure as instant compound D2 except where the methoxy groups are deuterium enriched. The copending case provides the following definition on page 9: PNG media_image9.png 121 691 media_image9.png Greyscale Accordingly, the claims of the copending case are generic to the compound D2 as instantly claimed. Furthermore, a person having ordinary skill in the art would have been familiar with permissible deuterium labeling at the analogous positions. Brucelle et al. teach compounds of the following general formula (page 1, support can be found in claim 1 of U.S. Provisional Application No. 62/881,163): PNG media_image3.png 219 219 media_image3.png Greyscale where G can be the following structure on page 7 (support can be found in claim 25 of the provisional application): PNG media_image4.png 219 216 media_image4.png Greyscale . Brucelle et al. further teach the following definitions for RG1-RG5 on page 8 (support can be found in claim 27 of the provisional application): PNG media_image5.png 241 714 media_image5.png Greyscale Brucelle et al. teach the use of both -OCH3 and -OC(2H)3. A person having ordinary skill in the art would have reasonably expected the instantly claimed compound to have similar utility as the non-enriched compound (as depicted in the claims of the copending case) and in view of the teachings of Brucelle et al. would have been motivated to prepare the instantly claimed deuterium labeled compound to test for any metabolic improvements. For instance, Kaur et al. teach in the abstract “Deuteration is an effective tool for the enhancement of drug’s metabolic profile.” Regarding instant claim 2, a person having ordinary skill in the art in seeking to test the instantly claimed compound’s utility would have been motivated to prepare pharmaceutical compositions for ease of administration to a patient such as by intravenous administration in claim 29 of the copending case. This is a provisional nonstatutory double patenting rejection. (6 of 9) Claims 1 and 2 are provisionally rejected on the ground of nonstatutory double patenting as being unpatentable over claims 1, 8, 11-18, 20, 24, 25, 40, 48-51, 62 and 69 of copending Application No. 18/292,508 in view of WO 2020/160192 A1 by Brucelle et al. and in further view of Kaur et al. Global Journal of Pharmacy & Pharmaceutical Science, 2017, 1(4): GJPPS.MS.ID.555566. Claim 48 of the copending case recites a method of using a compound having the following structure: PNG media_image10.png 192 368 media_image10.png Greyscale . The compound has the same backbone structure as instant compound D2 except where the methoxy groups are deuterium enriched. The copending case provides the following definition on page 17: PNG media_image11.png 125 684 media_image11.png Greyscale Accordingly, the claims of the copending case are generic to the compound D2 as instantly claimed. Furthermore, a person having ordinary skill in the art would have been familiar with permissible deuterium labeling at the analogous positions. Brucelle et al. teach compounds of the following general formula (page 1, support can be found in claim 1 of U.S. Provisional Application No. 62/881,163): PNG media_image3.png 219 219 media_image3.png Greyscale where G can be the following structure on page 7 (support can be found in claim 25 of the provisional application): PNG media_image4.png 219 216 media_image4.png Greyscale . Brucelle et al. further teach the following definitions for RG1-RG5 on page 8 (support can be found in claim 27 of the provisional application): PNG media_image5.png 241 714 media_image5.png Greyscale Brucelle et al. teach the use of both -OCH3 and -OC(2H)3. A person having ordinary skill in the art would have reasonably expected the instantly claimed compound to have similar utility as the non-enriched compound (as depicted in the claims of the copending case) and in view of the teachings of Brucelle et al. would have been motivated to prepare the instantly claimed deuterium labeled compound to test for any metabolic improvements. For instance, Kaur et al. teach in the abstract “Deuteration is an effective tool for the enhancement of drug’s metabolic profile.” Regarding instant claim 2, a person having ordinary skill in the art in seeking to test the instantly claimed compound’s utility in the claims of the copending case would have been motivated to prepare pharmaceutical compositions for ease of administration to a patient to generate the subject contain a chiral glutarimide. This is a provisional nonstatutory double patenting rejection. (7 of 9) Claims 1 and 2 are provisionally rejected on the ground of nonstatutory double patenting as being unpatentable over claims 1, 9, 11, 12, 14, 16, 17, 28-31, 33, 35, 45, 46, 49, 62, 83 and 84 of copending Application No. 18/856,340 in view of WO 2020/160192 A1 by Brucelle et al. and in further view of Kaur et al. Global Journal of Pharmacy & Pharmaceutical Science, 2017, 1(4): GJPPS.MS.ID.555566. Claim 14 of the copending case recites a method of using a compound having the following structure: PNG media_image12.png 243 605 media_image12.png Greyscale . The compound has the same backbone structure as instant compound D2 except where the methoxy groups are deuterium enriched. The copending case provides the following definition on pages 11 and 12: PNG media_image13.png 241 720 media_image13.png Greyscale Accordingly, the claims of the copending case are generic to the compound D2 as instantly claimed. Furthermore, a person having ordinary skill in the art would have been familiar with permissible deuterium labeling at the analogous positions. Brucelle et al. teach compounds of the following general formula (page 1, support can be found in claim 1 of U.S. Provisional Application No. 62/881,163): PNG media_image3.png 219 219 media_image3.png Greyscale where G can be the following structure on page 7 (support can be found in claim 25 of the provisional application): PNG media_image4.png 219 216 media_image4.png Greyscale . Brucelle et al. further teach the following definitions for RG1-RG5 on page 8 (support can be found in claim 27 of the provisional application): PNG media_image5.png 241 714 media_image5.png Greyscale Brucelle et al. teach the use of both -OCH3 and -OC(2H)3. A person having ordinary skill in the art would have reasonably expected the instantly claimed compound to have similar utility as the non-enriched compound (as depicted in the claims of the copending case) and in view of the teachings of Brucelle et al. would have been motivated to prepare the instantly claimed deuterium labeled compound to test for any metabolic improvements. For instance, Kaur et al. teach in the abstract “Deuteration is an effective tool for the enhancement of drug’s metabolic profile.” Regarding instant claim 2, a person having ordinary skill in the art in seeking to test the instantly claimed compound’s utility would have been motivated to prepare pharmaceutical compositions for ease of administration to a patient. This is a provisional nonstatutory double patenting rejection. (8 of 9) Claims 1 and 2 are provisionally rejected on the ground of nonstatutory double patenting as being unpatentable over claims 1-92 of copending Application No. 19/500,457 in view of WO 2020/160192 A1 by Brucelle et al. and in further view of Kaur et al. Global Journal of Pharmacy & Pharmaceutical Science, 2017, 1(4): GJPPS.MS.ID.555566. Claim 83 of the copending case recites a method of using a compound having the following structure: PNG media_image12.png 243 605 media_image12.png Greyscale . The compound has the same backbone structure as instant compound D2 except where the methoxy groups are deuterium enriched. The copending case provides the following definition on page 12: PNG media_image14.png 214 693 media_image14.png Greyscale Accordingly, the claims of the copending case are generic to the compound D2 as instantly claimed. Furthermore, a person having ordinary skill in the art would have been familiar with permissible deuterium labeling at the analogous positions. Brucelle et al. teach compounds of the following general formula (page 1, support can be found in claim 1 of U.S. Provisional Application No. 62/881,163): PNG media_image3.png 219 219 media_image3.png Greyscale where G can be the following structure on page 7 (support can be found in claim 25 of the provisional application): PNG media_image4.png 219 216 media_image4.png Greyscale . Brucelle et al. further teach the following definitions for RG1-RG5 on page 8 (support can be found in claim 27 of the provisional application): PNG media_image5.png 241 714 media_image5.png Greyscale Brucelle et al. teach the use of both -OCH3 and -OC(2H)3. A person having ordinary skill in the art would have reasonably expected the instantly claimed compound to have similar utility as the non-enriched compound (as depicted in the claims of the copending case) and in view of the teachings of Brucelle et al. would have been motivated to prepare the instantly claimed deuterium labeled compound to test for any metabolic improvements. For instance, Kaur et al. teach in the abstract “Deuteration is an effective tool for the enhancement of drug’s metabolic profile.” Regarding instant claim 2, a person having ordinary skill in the art in seeking to test the instantly claimed compound’s utility would have been motivated to prepare pharmaceutical compositions for ease of administration to a patient. This is a provisional nonstatutory double patenting rejection. (9 of 9) Claims 1 and 2 are provisionally rejected on the ground of nonstatutory double patenting as being unpatentable over claims 1-100 of copending Application No. 19/500,531 in view of WO 2020/160192 A1 by Brucelle et al. and in further view of Kaur et al. Global Journal of Pharmacy & Pharmaceutical Science, 2017, 1(4): GJPPS.MS.ID.555566. Claim 78 of the copending case recites a method of using a compound having the following structure: PNG media_image12.png 243 605 media_image12.png Greyscale . The compound has the same backbone structure as instant compound D2 except where the methoxy groups are deuterium enriched. The copending case provides the following definition on page 12: PNG media_image15.png 213 694 media_image15.png Greyscale Accordingly, the claims of the copending case are generic to the compound D2 as instantly claimed. Furthermore, a person having ordinary skill in the art would have been familiar with permissible deuterium labeling at the analogous positions. Brucelle et al. teach compounds of the following general formula (page 1, support can be found in claim 1 of U.S. Provisional Application No. 62/881,163): PNG media_image3.png 219 219 media_image3.png Greyscale where G can be the following structure on page 7 (support can be found in claim 25 of the provisional application): PNG media_image4.png 219 216 media_image4.png Greyscale . Brucelle et al. further teach the following definitions for RG1-RG5 on page 8 (support can be found in claim 27 of the provisional application): PNG media_image5.png 241 714 media_image5.png Greyscale Brucelle et al. teach the use of both -OCH3 and -OC(2H)3. A person having ordinary skill in the art would have reasonably expected the instantly claimed compound to have similar utility as the non-enriched compound (as depicted in the claims of the copending case) and in view of the teachings of Brucelle et al. would have been motivated to prepare the instantly claimed deuterium labeled compound to test for any metabolic improvements. For instance, Kaur et al. teach in the abstract “Deuteration is an effective tool for the enhancement of drug’s metabolic profile.” Regarding instant claim 2, a person having ordinary skill in the art in seeking to test the instantly claimed compound’s utility would have been motivated to prepare pharmaceutical compositions for ease of administration to a patient. This is a provisional nonstatutory double patenting rejection. Conclusion Any inquiry concerning this communication or earlier communications from the examiner should be directed to MATTHEW P COUGHLIN whose telephone number is (571)270-1311. The examiner can normally be reached Monday - Friday, 10 am - 6 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, Renee Claytor can be reached at 571-272-8394. 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. /MATTHEW P COUGHLIN/ Primary Examiner, Art Unit 1626
Read full office action

Prosecution Timeline

Nov 27, 2023
Application Filed
Jan 29, 2026
Non-Final Rejection — §DP (current)

Precedent Cases

Applications granted by this same examiner with similar technology

Patent 12600706
METHOD FOR MANUFACTURING LOW-VISCOSITY HARDENER
2y 5m to grant Granted Apr 14, 2026
Patent 12600708
PRODRUG COMPOUNDS OF 3,4-METHYLENEDIOXYMETHAMPHETAMINE (MDMA) AND METHODS OF SYNTHESIZING THE SAME
2y 5m to grant Granted Apr 14, 2026
Patent 12577236
NOVEL PROCESSES FOR PREPARATION OF TEZACAFTOR
2y 5m to grant Granted Mar 17, 2026
Patent 12577220
METHOD FOR MANUFACTURING (2,2-DIMETHYL-1,3-DIOXOLAN-4-YL)METHANOL
2y 5m to grant Granted Mar 17, 2026
Patent 12559503
ANTHELMINTIC AZA-BENZOTHIOPHENE AND AZA-BENZOFURAN COMPOUNDS
2y 5m to grant Granted Feb 24, 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
71%
Grant Probability
84%
With Interview (+12.2%)
2y 5m
Median Time to Grant
Low
PTA Risk
Based on 984 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