Prosecution Insights
Last updated: October 02, 2026
Application No. 18/727,019

POLYIMIDAZOLIUM-BASED CATIONIC ANTIMICROBIAL POLYMERS FOR NOVEL MASTITIS PROPHYLACTIC SOLUTIONS

Final Rejection §103
Filed
Jul 05, 2024
Priority
Jan 06, 2022 — provisional 63/266,477 +1 more
Examiner
HOLLOMAN, NANNETTE
Art Unit
1612
Tech Center
1600 — Biotechnology & Organic Chemistry
Assignee
Massachusetts Institute of Technology
OA Round
2 (Final)
61%
Grant Probability
Moderate
3-4
OA Rounds
9m
Est. Remaining
84%
With Interview

Examiner Intelligence

Grants 61% of resolved cases
61%
Career Allowance Rate
482 granted / 794 resolved
+0.7% vs TC avg
Strong +23% interview lift
Without
With
+22.8%
Interview Lift
resolved cases with interview
Typical timeline
3y 0m
Avg Prosecution
31 currently pending
Career history
817
Total Applications
across all art units

Statute-Specific Performance

§101
1.7%
-38.3% vs TC avg
§103
56.1%
+16.1% vs TC avg
§102
17.3%
-22.7% vs TC avg
§112
18.6%
-21.4% vs TC avg
Black line = Tech Center average estimate • Based on career data from 794 resolved cases

Office Action

§103
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 . Applicants' arguments, filed 06/30/2026, have been fully considered. Rejections and/or objections not reiterated from previous office actions are hereby withdrawn. The following rejections and/or objections are either reiterated or newly applied. They constitute the complete set presently being applied to the instant application. The text of those sections of Title 35, U.S. Code not included in this action can be found in a prior Office Action. Claim Rejections - 35 USC § 103 Claim(s) 1-20 were rejected under 35 U.S.C. 103 as being unpatentable over Chan et al. (WO2021242174A1, disclosed by applicant) in view Pedersen et al. (Frontiers in Veterinary Science, Volume 8, May 2021, disclosed by applicant). This rejection is maintained. Claims 1-12 are pending. Rejection Chan et al. disclose compounds in the form of polymer, oligomers and defined molecules having repeating units that all incorporate repeating units formed from an imidazolium group and a biodegradable chain connected to an adjacent repeating unit. The compounds disclosed herein may have antimicrobial activity and so may be used to treat microbial infection and/or to treat surfaces to prevent microbial infections (Abstract). Chan et al. disclose compound I, which meets the limitation of the polyimidazolium of the instant claims (Reference claims 7). Chan et al. disclose PIM chloride salts having significant antimicrobial activity to S. aureus and E. coli (p. 44-45, Tables 1 and 2). Chan et al. disclose when used as an antiseptic composition comprises from 0.1 to 20% by weight of polymer(p. 33, lines 11-16). Chan et al. disclose the subject include mammal, including cows, pigs, goats, sheep and humans (p. 27, lines 1-5). Chan et al. disclose composition comprising glycerol at concentration of less than 50% (p. 36, lines 14 and 15). Chan et al. differs from the instant claims insofar as they do not disclose treating mastitis in a mammal with the composition comprising PIM. Pedersen et al. disclose bovine mastitis is defined as inflammation of the mammary gland and is most commonly caused by bacterial infection. Pedersen et al. disclose the most common infectious agents of bovine mastitis are Staphylococcus aureus, Streptococcus agalactia, Escherichia coli, Streptococcus uberis and S. aureus (p. 1, Introduction) It would have been obvious to one of ordinary skill in the art before the effective filing date of the claimed invention to have used the composition comprising PIM of Chan to treat mastitis motivated by the desire to treat a condition from infectious agents of S. aureus and E. coli as taught by Pedersen, since Chan teaches treating infections from said infectious agents. Arguments Applicant’s Arguments Applicant argues from starting from Chan and without the knowledge of the present application, one skilled in the art would not have been motivated to even consider Pedersen. Applicant argues one skilled in the art would not have been motivated to ignore established treatments and instead search for and select the specific, novel polymers form Chan’s unrelated research context and the rejection is based on impermissible hindsight. Applicant argues even if motivated to combine the two references, one of ordinary skill in the art would not have possessed a reasonable expectation of success. Applicant argues surprising and unexpected results. Applicants’ arguments have been fully considered but they are not persuasive. Examiner’s Response The compounds disclosed herein may have antimicrobial activity and so may be used to treat microbial infection and/or to treat surfaces to prevent microbial infections (Abstract). Chan et al. disclose PIM chloride salts having significant antimicrobial activity to S. aureus and E. coli (p. 44-45, Tables 1 and 2). Chan et al. disclose treating cows. Therefore, providing the motivation to treat a bovine with any condition caused by S. aureus and E. coli. One of ordinary skill would also have possessed a reasonable expectation of success since the PIM chloride salts treat S. aureus and E. coli conditions which includes bovine mastitis as taught by Pedersen. In regard to unexpected results, the result of excellent bactericidal activity appears to be known, since Chan et al. disclose antibacterial broad-spectrum activity of PIM1 (Rable 3). Conclusion 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. Any inquiry concerning this communication or earlier communications from the examiner should be directed to NANNETTE HOLLOMAN whose telephone number is (571)270-5231. The examiner can normally be reached Monday-Friday 9am-6pm. 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, Sahana S. Kaup can be reached at 571-272-6897. 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. /NANNETTE HOLLOMAN/Primary Examiner, Art Unit 1612
Read full office action

Prosecution Timeline

Jul 05, 2024
Application Filed
Apr 07, 2026
Non-Final Rejection mailed — §103
Jun 30, 2026
Response Filed
Sep 10, 2026
Final Rejection mailed — §103 (current)

Precedent Cases

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Study what changed to get past this examiner. Based on 5 most recent grants.

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Prosecution Projections

3-4
Expected OA Rounds
61%
Grant Probability
84%
With Interview (+22.8%)
3y 0m (~9m remaining)
Median Time to Grant
Moderate
PTA Risk
Based on 794 resolved cases by this examiner. Grant probability derived from career allowance rate.

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