Prosecution Insights
Last updated: April 19, 2026
Application No. 18/672,226

MEK INHIBITORS AND METHODS OF THEIR USE

Final Rejection §103§DP
Filed
May 23, 2024
Examiner
CHEN, PO-CHIH
Art Unit
1621
Tech Center
1600 — Biotechnology & Organic Chemistry
Assignee
Exelixis Inc.
OA Round
2 (Final)
75%
Grant Probability
Favorable
3-4
OA Rounds
2y 7m
To Grant
88%
With Interview

Examiner Intelligence

Grants 75% — above average
75%
Career Allow Rate
553 granted / 740 resolved
+14.7% vs TC avg
Moderate +14% lift
Without
With
+13.8%
Interview Lift
resolved cases with interview
Typical timeline
2y 7m
Avg Prosecution
52 currently pending
Career history
792
Total Applications
across all art units

Statute-Specific Performance

§101
0.4%
-39.6% vs TC avg
§103
27.5%
-12.5% vs TC avg
§102
20.0%
-20.0% vs TC avg
§112
31.8%
-8.2% vs TC avg
Black line = Tech Center average estimate • Based on career data from 740 resolved cases

Office Action

§103 §DP
Notice of Pre-AIA or AIA Status The present application is being examined under the pre-AIA first to invent provisions. DETAILED ACTION This office action is a response to Applicant’s amendments/remarks after non-final rejection filed 9/16/2025. As filed, claims 42 and 44-46 are pending; and claims 1-41 and 43 are cancelled. Response to Amendments/Remarks Applicant’s amendments/remarks, filed 9/16/2025, with respect to claims 42 and 44-46, have been fully considered and are entered. The status for each rejection in the previous Office Action is set out below. The § 112(a) scope of enablement rejection of claims 42 and 44-46 is withdrawn per amendments. The nonstatutory obviousness-type double patenting (ODP) rejection of claims 42 and 44-46 by conflicting U.S. Patent No. 7,803,839 is maintained because the Applicant’s remarks are not persuasive. Although the claimed subject matter in the instant application is drawn to a method of using the compound, which was carved out in the restriction from the ‘839 patent, the § 121 safe harbor is only applicable to a divisional application filed as a result of the restriction requirement from the ’839 patent. Since the instant application is a continuation application and not filed as a divisional application of the ‘839 patent, the instant application is ineligible for the § 121 protection, according to guidance in MPEP 1481.03(II)(A). The nonstatutory obviousness-type double patenting (ODP) rejection of claims 42 and 44-46 by conflicting U.S. Patent No. 7,915,250 is withdrawn per remarks that the claims of the ‘250 patent are not directed to cobimetinib. The nonstatutory obviousness-type double patenting (ODP) rejection of claims 42 and 44-46 by conflicting U.S. Patent No. 8,362,002 is maintained without the filing and approval of a terminal disclaimer. Nonstatutory 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 claims at issue 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); and 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 a nonstatutory double patenting ground provided the reference application or patent either is shown to be commonly owned with this application, or claims an invention made as a result of activities undertaken within the scope of a joint research agreement. A terminal disclaimer must be signed in compliance with 37 CFR 1.321(b). The USPTO internet Web site contains terminal disclaimer forms which may be used. Please visit http://www.uspto.gov/forms/. The filing date of the application will determine what form 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 http://www.uspto.gov/patents/process/file/efs/guidance/eTD-info-I.jsp. The instant claims are drawn to method of treating ovarian cancer and endometrial cancer via cobimetinib or pharmaceutical salt thereof. Claims 42 and 44-46 are rejected on the ground of nonstatutory obviousness-type double patenting (ODP) as being unpatentable over the conflicting claims of the following U.S. patents or co-pending applications. See Table below. If the conflicting claims are in a co-pending application, then the rejection is a provisional ODP rejection because the conflicting claims have not in fact been patented. Co-pending Application No./ U.S. Patent No. Conflicting Claims Provisional ODP (Yes or No) 7,803,839 1-24, 35, and 57 No 8,362,002 1-23, 38, and 49 No The analysis employed for an obviousness-type double patenting rejection parallels the analysis for a determination of obviousness under 35 U.S.C. § 103. See MPEP 804; In re Braat, 937 F.2d 589, 19 USPQ 2d 1290 (Fed. Cir. 1991); In re Longi, 759 F.2d 887, 225 USPQ 645 (Fed. Cir. 1985). For this reason, the factual inquires set forth in Graham v. John Deere Co., 383 U.S. 1, USPQ 459 (1966) are employed herein. The Graham v. Deere inquires are summarized as follows: (A) Determining the scope and contents of the patent claim relative to a claim in the application at issue; (B) Ascertaining the differences between the scope and content of the patent claim as determined in (A) and the claim in the application at issue; (C) Determine the level of ordinary skill in the pertinent art; and, (D) Evaluate any objective indicia of nonobviousness. (A) Determining the scope and contents of the patent claim relative to a claim in the application at issue – The conflicting claims of the abovementioned U.S. patents are drawn to the compound of cobimetinib and/or a method of treating ovarian or endometrial cancer via cobimetinib or pharmaceutically acceptable salt thereof. (B) Ascertaining the differences between the scope and content of the patent claim as determined in (A) and the claim in the application at issue - The conflicting claims of the abovementioned U.S. patents described cobimetinib in a Markush structure and/or in a compound-type claim. (C) Determine the level of ordinary skill in the pertinent art - the level of ordinary skill in the art may be found by inquiring into: (1) the type of problems encountered in the art; (2) prior art solutions to those problems; (3) the rapidity with which innovations are made; (4) the sophistication of the technology; and (5) the education level of active workers in the field. Custom Accessories, Inc. v. Jeffrey-Allan Industries, Inc., 807 F.2d 855, 962 (Fed. Cir. 1986). All of those factors may not be present in every case, and one or more of them may predominate. Envtl. Designs, Ltd. v. Union Oil Co., 713 F.2d 693, 696 (Fed. Cir. 1983). Based on the typical education level of active workers in the field of organic chemistry, as well as the high degree of sophistication required to solve problems encountered in the art, the Examiner finds that a person of ordinary skill in the art would have at least a college degree in the field related to medicine, chemistry, and/or the pharmaceutical art and at least four years of work experience, i.e. a masters or doctorate level scientist/clinician. (D) Evaluate any objective indicia of nonobviousness - none Conclusion - Although the conflicting claims are not identical, one of ordinary skill in the art would recognize that they are not patentably distinct from each other because they are drawn to the same compound having the same therapeutic utility (e.g. MEK inhibitor, etc.). As a result, an infringer of a patent issuing from the instant claims would also be an infringer of the conflicting claims of the abovementioned U.S. patents. As recited above, the compound in the conflicting claims of abovementioned U.S. patents is the cobimetinib. However, these conflicting claims may have described cobimetinib in a Markush structure and/or in a compound-type claim. Structural similarity is the touchstone of the nonobviousness inquiry for patents claiming a novel chemical compound. Eisai Co. v. Dr. Reddy's Laboratories, 533 F.3d1353,1356-57 (Fed. Cir. 2008). In this case, the compounds are the same; i.e., they have the same atomic composition and the same atomic connectivity. For this reason, one of ordinary skill in the art would anticipate that this is the same compound. The unpredictable nature of the chemical arts generally allows an assertion of similarity to be rebutted by a sufficient demonstration of nonobviousness that employs secondary considerations of objective indicia. In this case, there are no indicia of nonobviousness shown to provide evidence that the Markush structure of the abovementioned U.S. patents is excluded as the instant cobimetinib of the instant application. Absent indicia of nonobviousness, the Examiner finds that one of ordinary skill in the art would consider the instant compound forms and that of the conflicting claims of the abovementioned U.S. patents to be equally effective in their objective. This rejection is in agreement with the judicially created doctrine grounded in public policy 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. Claim Objections Claim 1 is objected to because of the following informalities: Regarding claim 1, the claim recites the phrase, “arresting the development of or causing the regression of cancer”, which contains typographical error. Such typo can be corrected by reciting -- arresting . Appropriate correction is required. Conclusion Claims 42 and 44-46 are rejected. Claim 1 is objected. Claims 1-41 and 43 are cancelled. THIS ACTION IS MADE FINAL. 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. Telephone Inquiry Any inquiry concerning this communication or earlier communications from the examiner should be directed to PO-CHIH CHEN whose telephone number is (571)270-7243. The examiner can normally be reached Monday - Friday 10:00 am to 6:00 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, Clinton Brooks can be reached at (571)270-7682. 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. /PO-CHIH CHEN/Primary Examiner, Art Unit 1621
Read full office action

Prosecution Timeline

May 23, 2024
Application Filed
Jun 12, 2025
Non-Final Rejection — §103, §DP
Sep 16, 2025
Response Filed
Dec 22, 2025
Final Rejection — §103, §DP (current)

Precedent Cases

Applications granted by this same examiner with similar technology

Patent 12595225
METHOD FOR PRODUCING ASYMMETRIC LINEAR CARBONATE
2y 5m to grant Granted Apr 07, 2026
Patent 12582632
INHIBITION OF NEUROLOGICAL INJURIES DUE TO INFECTIONS VIA ADMINISTRATION OF BUTANETAP AND ANALOGS THEREOF
2y 5m to grant Granted Mar 24, 2026
Patent 12571801
Tandem Activity-Based Sensing and Labeling Strategy for Reactive Oxygen Species Imaging
2y 5m to grant Granted Mar 10, 2026
Patent 12552792
SOLID FORMS OF AN FGFR INHIBITOR AND PROCESSES FOR PREPARING THE SAME
2y 5m to grant Granted Feb 17, 2026
Patent 12552782
Analogs of Nitrofuran Antibiotics to Combat Resistance
2y 5m to grant Granted Feb 17, 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

3-4
Expected OA Rounds
75%
Grant Probability
88%
With Interview (+13.8%)
2y 7m
Median Time to Grant
Moderate
PTA Risk
Based on 740 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