Prosecution Insights
Last updated: April 19, 2026
Application No. 18/582,581

IN SITU EXPANSION OF ENGINEERED DEVICES FOR REGENERATION

Non-Final OA §DP
Filed
Feb 20, 2024
Examiner
BARRON, SEAN C
Art Unit
1653
Tech Center
1600 — Biotechnology & Organic Chemistry
Assignee
Trustees Of Boston University
OA Round
3 (Non-Final)
53%
Grant Probability
Moderate
3-4
OA Rounds
3y 8m
To Grant
85%
With Interview

Examiner Intelligence

Grants 53% of resolved cases
53%
Career Allow Rate
323 granted / 605 resolved
-6.6% vs TC avg
Strong +32% interview lift
Without
With
+31.6%
Interview Lift
resolved cases with interview
Typical timeline
3y 8m
Avg Prosecution
68 currently pending
Career history
673
Total Applications
across all art units

Statute-Specific Performance

§101
6.2%
-33.8% vs TC avg
§103
43.6%
+3.6% vs TC avg
§102
16.0%
-24.0% vs TC avg
§112
22.4%
-17.6% vs TC avg
Black line = Tech Center average estimate • Based on career data from 605 resolved cases

Office Action

§DP
DETAILED ACTION The present application, filed on or after March 16, 2013, is being examined under the first inventor to file provisions of the AIA . Continued Examination Under 37 CFR 1.114 A request for continued examination under 37 CFR 1.114, including the fee set forth in 37 CFR 1.17(e), was filed in this application after final rejection. Since this application is eligible for continued examination under 37 CFR 1.114, and the fee set forth in 37 CFR 1.17(e) has been timely paid, the finality of the previous Office action has been withdrawn pursuant to 37 CFR 1.114. Applicant's submission filed on 11/24/2025 has been entered. Response to Amendments Applicant's reply filed 11/24/2025 has been entered. The claims were not amended. Claims 1-16 remain pending, and are considered on their merits. References not included with this Office action can be found in a prior action. Any rejections of record not particularly addressed below are withdrawn in light of the claim amendments and/or applicant’s comments. Affidavit/Declaration The Declaration under 37 CFR 1.132 filed 11/12/2025 is sufficient to overcome the rejection of claims 1-16 based upon Chen. The Declaration persuasively sets forth that the claimed composition comprising normal human dermal fibroblasts (NHDFs) appears to have an unexpected effect of preventing tumor formation when administered to subjects as compared to J2 mouse fibroblasts based upon the instant disclosure. 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 1, 5, 7, and 14-16 are rejected on the ground of nonstatutory double patenting as being unpatentable over claims 17-23 of U.S. Patent No. US 11,338,065 (provided in the IDS dated 8/02/2024). Although the claims at issue are not identical, they are not patentably distinct from each other because dependent claim 22 of the ‘065 patent is directed towards an ex vivo engineered tissue seed composition comprising patterned endothelial cell cords patterned embedded in a biocompatible hydrogel scaffold, hepatocyte aggregates not in direct contact with the endothelial cell cords, and human fibroblasts. There is no evidence at this time that the product-by-process limitations of instant claim 1 (b) otherwise impart any structural difference to the claimed composition as compared to the composition of the ‘065 patent, and so claim 22 of the ‘065 patent reasonably anticipates instant claim 1 absent any persuasive showing to the contrary (See M.P.E.P. § 2113). Claim 18 of the ‘065 patent reads on instant claim 5. Claim 20 of the ‘065 patent reads on instant claim 7. Claim 23 of the ‘065 patent reads on instant claim 14. Claim 21 of the ‘065 patent reads on instant claim 15. Claim 19 of the ‘065 patent reads on instant claim 16. Claims 1-16 are rejected on the ground of nonstatutory double patenting as being unpatentable over claims 1-16 of U.S. Patent No. U.S. Patent No. US 11,338,065 (provided in the IDS dated 8/02/2024). Although the claims at issue are not identical, they are not patentably distinct from each other because claim 1 of the ‘065 patent is an ex vivo engineered tissue seed composition comprising patterned endothelial cell cords patterned embedded in a biocompatible hydrogel scaffold, hepatocyte aggregates not in direct contact with the endothelial cell cords, and human fibroblasts, and so anticipates instant claim 1. In the same order as presented, claims 2-16 of the ‘065 patent read on instant claims 2-16. Response to Arguments Applicant’s arguments on pages have been fully considered, but are moot because the new grounds of rejection do not rely on any reference applied in the prior rejection of record for any teaching or matter specifically challenged in the argument. Conclusion No claims are allowed. Any inquiry concerning this communication or earlier communications from the examiner should be directed to SEAN C BARRON whose telephone number is (571)270-5111. The examiner can normally be reached 7:30am-3:30pm EDT/EST (M-F). 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, Sharmila Landau can be reached at 571-272-0614. 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. /Sean C. Barron/Primary Examiner, Art Unit 1653
Read full office action

Prosecution Timeline

Feb 20, 2024
Application Filed
Mar 12, 2025
Non-Final Rejection — §DP
Jun 18, 2025
Response Filed
Aug 11, 2025
Final Rejection — §DP
Nov 12, 2025
Response after Non-Final Action
Nov 12, 2025
Response after Non-Final Action
Nov 24, 2025
Request for Continued Examination
Dec 01, 2025
Response after Non-Final Action
Feb 12, 2026
Non-Final Rejection — §DP (current)

Precedent Cases

Applications granted by this same examiner with similar technology

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2y 5m to grant Granted Mar 24, 2026
Patent 12558424
T CELLS HAVING ENHANCED ANTI-TUMOR ACTIVITY
2y 5m to grant Granted Feb 24, 2026
Patent 12550890
SYSTEM AND METHOD FOR MAINTAINING ORGAN VIABILITY
2y 5m to grant Granted Feb 17, 2026
Patent 12551511
METHODS TO DIFFERENTIATE STEM CELLS INTO HORMONE-PRODUCING CELLS
2y 5m to grant Granted Feb 17, 2026
Patent 12544407
FIBROBLAST CELL THERAPY FOR TREATMENT OF OSTEOPOROSIS
2y 5m to grant Granted Feb 10, 2026
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
53%
Grant Probability
85%
With Interview (+31.6%)
3y 8m
Median Time to Grant
High
PTA Risk
Based on 605 resolved cases by this examiner. Grant probability derived from career allow rate.

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