Prosecution Insights
Last updated: October 28, 2026
Application No. 19/092,890

METHODS FOR CONTINUOUS MANUFACTURE OF LIPOSOMAL DRUG PRODUCTS

Non-Final OA §DP
Filed
Mar 27, 2025
Priority
Mar 30, 2018 — provisional 62/650,372 +3 more
Examiner
HOLLOMAN, NANNETTE
Art Unit
1612
Tech Center
1600 — Biotechnology & Organic Chemistry
Assignee
Insmed Incorporated
OA Round
1 (Non-Final)
61%
Grant Probability
Moderate
1-2
OA Rounds
1y 5m
Est. Remaining
84%
With Interview

Examiner Intelligence

Grants 61% of resolved cases
61%
Career Allowance Rate
485 granted / 799 resolved
+0.7% vs TC avg
Strong +23% interview lift
Without
With
+23.1%
Interview Lift
resolved cases with interview
Typical timeline
3y 0m
Avg Prosecution
35 currently pending
Career history
837
Total Applications
across all art units

Statute-Specific Performance

§101
1.7%
-38.3% vs TC avg
§103
55.7%
+15.7% vs TC avg
§102
17.4%
-22.6% vs TC avg
§112
18.8%
-21.2% vs TC avg
Black line = Tech Center average estimate • Based on career data from 799 resolved cases

Office Action

§DP
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 . 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 filing of a terminal disclaimer by itself is not a complete reply to a nonstatutory double patenting (NSDP) rejection. A complete reply requires that the terminal disclaimer be accompanied by a reply requesting reconsideration of the prior Office action. Even where the NSDP rejection is provisional the reply must be complete. See MPEP § 804, subsection I.B.1. For a reply to a non-final Office action, see 37 CFR 1.111(a). For a reply to final Office action, see 37 CFR 1.113(c). A request for reconsideration while not provided for in 37 CFR 1.113(c) may be filed after final for consideration. See MPEP §§ 706.07(e) and 714.13. The USPTO Internet website contains terminal disclaimer forms which may be used. Please visit www.uspto.gov/patent/patents-forms. The actual 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/apply/applying-online/eterminal-disclaimer. Claims 2, 4, 7, 8, 10, 17, 18, 20, 22, 23,29, 30, 33-36, 50, 59, 60 and 64-66 are rejected on the ground of nonstatutory double patenting as being unpatentable over claims 1-21 of U.S. Patent No. 12,290,600. Although the claims at issue are not identical, they are not patentably distinct from each other because in each case the claims recite a method for continuously manufacturing a liposomal active pharmaceutical ingredient (API) formulation, comprising, mixing a lipid solution comprising a lipid dissolved in an organic solvent with an aqueous API solution, wherein the lipid solution and aqueous API solution are mixed from two separate streams in an in-line fashion, and wherein a liposomal encapsulated API is formed at the intersection of the two streams, introducing the liposomal encapsulated API into a first central vessel comprising an inlet and an outlet, through the inlet, wherein the outlet is in fluid communication with an inlet of a first tangential flow filtration (TFF) unit comprising the inlet and a first and second outlet, wherein the first outlet of the first TFF unit is in fluid communication with an inlet of a second TFF unit comprising the inlet and a first and second outlet, and the second outlet of the first TFF unit is a waste permeate outlet; and wherein the first outlet of the second TFF unit is a retentate outlet and the second outlet of the second TFF unit is a waste permeate outlet; flowing the liposomal encapsulated API into the first TFF unit for a first period of time, wherein the liposomal encapsulated API enters the first TFF unit through the inlet of the first TFF unit and exits through the first outlet of the first TFF unit; flowing the liposomal encapsulated API from the first outlet of the first TFF unit through the inlet of the second TFF unit for a second period of time; and collecting the liposomal API formulation from the first outlet of the second TFF unit, wherein the liposomal encapsulated API is subjected to continuous in-line diafiltration via TFF prior to collecting the liposomal API formulation. Claims 2, 4, 7, 8, 10, 17, 18, 20, 22, 23,29, 30, 33-36, 50, 59, 60 and 64-66 are rejected on the ground of nonstatutory double patenting as being unpatentable over claims 1-22 of U.S. Patent No. 11,571,386. Although the claims at issue are not identical, they are not patentably distinct from each other because in each case the claims recite a method for continuously manufacturing a liposomal active pharmaceutical ingredient (API) formulation, comprising, mixing a lipid solution comprising a lipid dissolved in an organic solvent with an aqueous API solution, wherein the lipid solution and aqueous API solution are mixed from two separate streams in an in-line fashion, and wherein a liposomal encapsulated API is formed at the intersection of the two streams, introducing the liposomal encapsulated API into a first central vessel comprising an inlet and an outlet, through the inlet, wherein the outlet is in fluid communication with an inlet of a first tangential flow filtration (TFF) unit comprising the inlet and a first and second outlet, wherein the first outlet of the first TFF unit is in fluid communication with an inlet of a second TFF unit comprising the inlet and a first and second outlet, and the second outlet of the first TFF unit is a waste permeate outlet; and wherein the first outlet of the second TFF unit is a retentate outlet and the second outlet of the second TFF unit is a waste permeate outlet; flowing the liposomal encapsulated API into the first TFF unit for a first period of time, wherein the liposomal encapsulated API enters the first TFF unit through the inlet of the first TFF unit and exits through the first outlet of the first TFF unit; flowing the liposomal encapsulated API from the first outlet of the first TFF unit through the inlet of the second TFF unit for a second period of time; and collecting the liposomal API formulation from the first outlet of the second TFF unit, wherein the liposomal encapsulated API is subjected to continuous in-line diafiltration via TFF prior to collecting the liposomal API formulation. Conclusion 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

Mar 27, 2025
Application Filed
Sep 30, 2026
Examiner Interview (Telephonic)
Oct 02, 2026
Non-Final Rejection mailed — §DP (current)

Precedent Cases

Applications granted by this same examiner with similar technology

Patent 12734181
METHODS FOR PREPARING LIPOSOMAL FORMULATIONS
2y 8m to grant Granted Sep 15, 2026
Patent 12728079
POWDER DISPERSION COMPOSITION AND COSMETIC OBTAINED USING SAME
3y 2m to grant Granted Sep 08, 2026
Patent 12716073
COMPOSITION OF SHELF-STABLE PLASMID DNA/POLYETHYLENEIMINE (PEI) PARTICLES WITH DEFINED SIZES FOR VIRAL VECTOR PRODUCTION AND METHOD FOR PREPARATION OF THE SAME
3y 0m to grant Granted Aug 25, 2026
Patent 12702648
TELODENDRIMER NANOCARRIERS FOR MONOMERIC AMPHOTERICIN B DELIVERY
2y 6m to grant Granted Aug 11, 2026
Patent 12691065
LIPOSOME FORMULATIONS FOR TREATMENT OF CANCERS AND DRUG RESISTANCE OF CANCERS
3y 8m to grant Granted Jul 28, 2026
Study what changed to get past this examiner. Based on 5 most recent grants.

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Prosecution Projections

1-2
Expected OA Rounds
61%
Grant Probability
84%
With Interview (+23.1%)
3y 0m (~1y 5m remaining)
Median Time to Grant
Low
PTA Risk
Based on 799 resolved cases by this examiner. Grant probability derived from career allowance rate.

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