Prosecution Insights
Last updated: April 19, 2026
Application No. 18/558,396

METHODS AND DEVICES FOR MECHANICAL SEPARATION OF MULTILAYER INTERLAYERS

Final Rejection §103§112
Filed
Nov 01, 2023
Examiner
SENGUPTA, SONYA MAZUMDAR
Art Unit
1745
Tech Center
1700 — Chemical & Materials Engineering
Assignee
Solutia Inc.
OA Round
2 (Final)
68%
Grant Probability
Favorable
3-4
OA Rounds
3y 2m
To Grant
88%
With Interview

Examiner Intelligence

Grants 68% — above average
68%
Career Allow Rate
483 granted / 708 resolved
+3.2% vs TC avg
Strong +20% interview lift
Without
With
+20.1%
Interview Lift
resolved cases with interview
Typical timeline
3y 2m
Avg Prosecution
16 currently pending
Career history
724
Total Applications
across all art units

Statute-Specific Performance

§101
0.6%
-39.4% vs TC avg
§103
46.5%
+6.5% vs TC avg
§102
27.2%
-12.8% vs TC avg
§112
20.9%
-19.1% vs TC avg
Black line = Tech Center average estimate • Based on career data from 708 resolved cases

Office Action

§103 §112
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 . Response to Arguments Applicant’s amendments and arguments with respect to claims 2-16 have been considered but are moot because the new ground of rejection does not rely on any reference applied in the prior rejection of record for any teaching or matter specifically challenged in the argument. Claim Rejections - 35 USC § 112 The following is a quotation of the first paragraph of 35 U.S.C. 112(a): (a) IN GENERAL.—The specification shall contain a written description of the invention, and of the manner and process of making and using it, in such full, clear, concise, and exact terms as to enable any person skilled in the art to which it pertains, or with which it is most nearly connected, to make and use the same, and shall set forth the best mode contemplated by the inventor or joint inventor of carrying out the invention. The following is a quotation of the first paragraph of pre-AIA 35 U.S.C. 112: The specification shall contain a written description of the invention, and of the manner and process of making and using it, in such full, clear, concise, and exact terms as to enable any person skilled in the art to which it pertains, or with which it is most nearly connected, to make and use the same, and shall set forth the best mode contemplated by the inventor of carrying out his invention. Claim 3 is rejected under 35 U.S.C. 112(a) or 35 U.S.C. 112 (pre-AIA ), first paragraph, as failing to comply with the written description requirement. The claim(s) contains subject matter which was not described in the specification in such a way as to reasonably convey to one skilled in the relevant art that the inventor or a joint inventor, or for applications subject to pre-AIA 35 U.S.C. 112, the inventors, at the time the application was filed, had possession of the claimed invention. It is unclear if poly(vinyl acetal) is in the multilayer sheet that already encompasses poly(vinyl butyral). The following is a quotation of 35 U.S.C. 112(b): (b) CONCLUSION.—The specification shall conclude with one or more claims particularly pointing out and distinctly claiming the subject matter which the inventor or a joint inventor regards as the invention. The following is a quotation of 35 U.S.C. 112 (pre-AIA ), second paragraph: The specification shall conclude with one or more claims particularly pointing out and distinctly claiming the subject matter which the applicant regards as his invention. Claim 3 is rejected under 35 U.S.C. 112(b) or 35 U.S.C. 112 (pre-AIA ), second paragraph, as being indefinite for failing to particularly point out and distinctly claim the subject matter which the inventor or a joint inventor (or for applications subject to pre-AIA 35 U.S.C. 112, the applicant), regards as the invention. It is unclear if poly(vinyl acetal) is in the multilayer sheet that already encompasses poly(vinyl butyral). Claim Rejections - 35 USC § 103 The text of those sections of Title 35, U.S. Code not included in this action can be found in a prior Office action. Claims 2 and 4-16 are rejected under 35 U.S.C. 103, as being unpatentable over Van Allen et al. (US 5,520,776) in view of Hovercam (US 5,846,363). With respect to claims 2, 4-8, 10, and 11, Van Allen et al. teach a continuous process for separating a first layer from a remainder of a multilayer interlayer sheet, the process comprising: a. heating the multilayer sheet to a temperature; and b. thereafter separating the first layer from the remainder of the multilayer interlayer sheet by pulling the first layer and the remainder of the multilayer interlayer sheet (column 3, lines 43-57; column 4, lines 13-24; Figure 8). Although the claimed angles are not taught, it is inherent that the claimed angles would have been customized. However, if it is not inherent, it would have been obvious for the claimed angles to be customized, and would have been motivated to do so to initiate peeling (column 1, lines 51-62). With respect to claims 7 and 9, although not explicitly taught by Van Allen et al., it would have been obvious to use poly(vinyl butyral) polymer in a multilayer sheet to be used as glass (abstract). With respect to claim 12, although not explicitly taught by Van Allen et al., it would have been obvious where the multilayer sheet comprises a core layer, with a skin layer on each side to be used as glass. With respect] to claims 13-16, “Claim analysis is highly fact-dependent. A claim is only limited by positively recited elements. Thus, “[i]inclusion of the material or article worked upon by a structure being claimed does not impart patentability to the claims.” In re Otto, 312 F.2d 937, 136 USPQ 458, 459 (CCPA 1963); see also In re Young, 75 F.2d 996, 25 USPQ 69 (CCPA 1935).” Conclusion Applicant's amendment necessitated the new ground(s) of rejection presented in this Office action. Accordingly, THIS ACTION IS MADE FINAL. See MPEP § 706.07(a). 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 SONYA M SENGUPTA whose telephone number is (571)272-6019. The examiner can normally be reached Monday-Friday, 9:30am-5:00pm. 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, Philip Tucker can be reached at 571-272-1098. 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. /SONYA M SENGUPTA/Primary Examiner, Art Unit 1745
Read full office action

Prosecution Timeline

Nov 01, 2023
Application Filed
Jun 25, 2025
Non-Final Rejection — §103, §112
Nov 25, 2025
Response Filed
Dec 11, 2025
Final Rejection — §103, §112 (current)

Precedent Cases

Applications granted by this same examiner with similar technology

Patent 12604704
WAFER TRANSFER METHOD AND WAFER TRANSFER APPARATUS
2y 5m to grant Granted Apr 14, 2026
Patent 12595089
PEELING AND STICKING METHOD AND PROGRAM
2y 5m to grant Granted Apr 07, 2026
Patent 12589530
VEHICLE INTERIOR PANEL WITH NON-UNIFORM HARDNESS
2y 5m to grant Granted Mar 31, 2026
Patent 12589904
LABEL WRAPPING DEVICE INCLUDING INSERTION PART AND WRAPPING PART TO WRAP LABEL AROUND ADHEREND INSERTED IN INSERTION PART
2y 5m to grant Granted Mar 31, 2026
Patent 12590227
ADHESIVE PAPER AND ELECTROCHEMICAL APPARATUS AND ELECTRONIC APPARATUS CONTAINING SUCH ADHESIVE PAPER
2y 5m to grant Granted Mar 31, 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
68%
Grant Probability
88%
With Interview (+20.1%)
3y 2m
Median Time to Grant
Moderate
PTA Risk
Based on 708 resolved cases by this examiner. Grant probability derived from career allow rate.

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