Prosecution Insights
Last updated: April 19, 2026
Application No. 18/605,632

Gas Exchange Composite Membranes and Methods of Use Thereof

Non-Final OA §DP
Filed
Mar 14, 2024
Examiner
DEAK, LESLIE R
Art Unit
3799
Tech Center
3700 — Mechanical Engineering & Manufacturing
Assignee
The Regents of the University of California
OA Round
1 (Non-Final)
75%
Grant Probability
Favorable
1-2
OA Rounds
3y 4m
To Grant
93%
With Interview

Examiner Intelligence

Grants 75% — above average
75%
Career Allow Rate
693 granted / 924 resolved
+5.0% vs TC avg
Strong +18% interview lift
Without
With
+18.0%
Interview Lift
resolved cases with interview
Typical timeline
3y 4m
Avg Prosecution
43 currently pending
Career history
967
Total Applications
across all art units

Statute-Specific Performance

§101
1.8%
-38.2% vs TC avg
§103
47.9%
+7.9% vs TC avg
§102
25.1%
-14.9% vs TC avg
§112
11.4%
-28.6% vs TC avg
Black line = Tech Center average estimate • Based on career data from 924 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 54-57, 59-60 are rejected on the ground of nonstatutory double patenting as being unpatentable over claims 1-5 of U.S. Patent No. 11,938,253 to Roy et al. Although the claims at issue are not identical, they are not patentably distinct from each other for the following reasons: With regard to claim 54, patented claim 1 sets forth a blood oxygenation device with a blood channel and a gas channel, and a gas exchange composite comprises a nonporous gas permeable membrane, a noncompliant microporous membrane with gas diffusion windows and struts with micropores, wherein the first surface of the polymeric membrane provides an antithrombotic surface for gas exchange over the windows. With regard to claim 55, Applicant is setting forth a second gas channel with a membrane. It has been held that the mere duplication of the parts of an apparatus found in the prior art is not patentably significant unless a new and unexpected result is produced. See MPEP § 2144.04 (VI)(B). With regard to claims 56, 57, see patented claims 3 and 2, respectively. With regard to claims 59-60, see patented claims 4-5, respectively. With regard to claims 61-71, 89, the limitations are drawn to generic features of blood oxygenators that are common in the art. However, they depend from claim 54 which would be patentable over the prior art upon filing of a Terminal Disclaimer to US Patent No. 11,938,253. Claims 72, 73, 88, 93-97 rejected on the ground of nonstatutory double patenting as being unpatentable over claim 1 of U.S. Patent No. 11,938,253 to Roy et al in view of claims 2, 10, 16-21 of U.S. Patent No. 10,695,480 to Roy et al. Although the claims at issue are not identical, they are not patentably distinct from each other for the following reasons: With regard to claims 72 and 73, Roy ’253 sets forth the device of claim 54 (see rejections above), and claims 17 and 18 of Roy ’480 sets forth the functionalization of the channel with heparin. With regard to claims 88, 93, 94, 95, 96, 97, see Roy ’480 claims 10, 2, 16, 19 , 20, 21 respectively. Claims 87, 90, 91 rejected on the ground of nonstatutory double patenting as being unpatentable over claim 1 of U.S. Patent No. 11,938,253 to Roy et al in view of U.S. 2016/0058933 to Ballantyne et al. Although the claims at issue are not identical, they are not patentably distinct from each other for the following reasons: With regard to claims 87, 90, and 91, Roy ’253 sets forth the device of claim 54 (see rejections above). Ballantyne discloses an extracorporeal blood treatment device that incorporates peristaltic pumps, a gas supply with a flow conduit, and a heparin pump, demonstrating that all these elements are known in the art. It would have been within the skill of a person in the art to add the conventional extracorporeal elements disclosed by Ballantyne to the gas exchange medium claimed by Roy ’253 in order to arrive at the claimed invention. Conclusion Any inquiry concerning this communication or earlier communications from the examiner should be directed to LESLIE R DEAK whose telephone number is (571)272-4943. The examiner can normally be reached Monday-Friday, 9am to 5:30pm. 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, Sarah Al-Hashimi can be reached at 571-272-7159. 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. /LESLIE R DEAK/Primary Examiner, Art Unit 3799 4 March 2026
Read full office action

Prosecution Timeline

Mar 14, 2024
Application Filed
Mar 09, 2026
Non-Final Rejection — §DP (current)

Precedent Cases

Applications granted by this same examiner with similar technology

Patent 12599497
IMPLANTS WITH CONTROLLED DRUG DELIVERY FEATURES AND METHODS OF USING SAME
2y 5m to grant Granted Apr 14, 2026
Patent 12594186
AQUEOUS HUMOR DRAINAGE DEVICE WITH ADJUSTABLE TUBE DIAMETER
2y 5m to grant Granted Apr 07, 2026
Patent 12575972
GLAUCOMA STENT AND METHODS THEREOF FOR GLAUCOMA TREATMENT
2y 5m to grant Granted Mar 17, 2026
Patent 12569604
METHOD AND DEVICES FOR DETERMINING A TIME POINT FOR MEASURING PRESSURE MEASUREMENTS
2y 5m to grant Granted Mar 10, 2026
Patent 12569654
SYSTEMS AND METHODS FOR TREATMENT OF FLUID OVERLOAD
2y 5m to grant Granted Mar 10, 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
75%
Grant Probability
93%
With Interview (+18.0%)
3y 4m
Median Time to Grant
Low
PTA Risk
Based on 924 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