Prosecution Insights
Last updated: August 16, 2026
Application No. 18/558,396

METHODS AND DEVICES FOR MECHANICAL SEPARATION OF MULTILAYER INTERLAYERS

Non-Final OA §103
Filed
Nov 01, 2023
Priority
May 28, 2021 — provisional 63/194,295 +2 more
Examiner
SENGUPTA, SONYA MAZUMDAR
Art Unit
1745
Tech Center
1700 — Chemical & Materials Engineering
Assignee
Eastman Chemical Company
OA Round
3 (Non-Final)
69%
Grant Probability
Favorable
3-4
OA Rounds
4m
Est. Remaining
89%
With Interview

Examiner Intelligence

Grants 69% — above average
69%
Career Allowance Rate
493 granted / 719 resolved
+3.6% vs TC avg
Strong +20% interview lift
Without
With
+20.1%
Interview Lift
resolved cases with interview
Typical timeline
3y 1m
Avg Prosecution
20 currently pending
Career history
733
Total Applications
across all art units

Statute-Specific Performance

§101
0.4%
-39.6% vs TC avg
§103
50.2%
+10.2% vs TC avg
§102
25.5%
-14.5% vs TC avg
§112
20.8%
-19.2% vs TC avg
Black line = Tech Center average estimate • Based on career data from 719 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 . 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and the fee set forth in 37 CFR 1.17(e) has been timely paid, the finality of the previous Office action has been withdrawn pursuant to 37 CFR 1.114.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 5/18/2026 has been entered. Response to Arguments Applicant's arguments filed 5/18/2026 have been fully considered but they are not persuasive. As mentioned below, although the claimed angles are not taught, it is inherent that the claimed angles would have been customized to match the claimed criteria. For example, angles α is 1, β is 32, and γ is 148. 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 separation (column 1, lines 51-62). 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 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 571-272-1095. 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 27, 2025
Non-Final Rejection mailed — §103
Nov 25, 2025
Response Filed
Dec 16, 2025
Final Rejection mailed — §103
May 18, 2026
Request for Continued Examination
May 21, 2026
Response after Non-Final Action
Jun 02, 2026
Non-Final Rejection mailed — §103 (current)

Precedent Cases

Applications granted by this same examiner with similar technology

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METHOD FOR MANUFACTURING A STRIP OF COMPOSITE MATERIAL INTENDED TO FORM A TUBULAR STRUCTURE AND CORRESPONDING INSTALLATION
1y 9m to grant Granted Aug 04, 2026
Patent 12697475
Microneedle Patch Base Layer Lamination and Separation Device, Microneedle Patch Base Layer Lamination Device, and Microneedle Patch Demolding and Separation Device
1y 8m to grant Granted Aug 04, 2026
Patent 12686154
METHOD FOR RECYCLING END-OF-LIFE SOLAR PANELS
2y 2m to grant Granted Jul 21, 2026
Patent 12686202
ROLL-TO-ROLL GLASS LAMINATION SYSTEM AND METHOD OF LAMINATING GLASS
2y 5m to grant Granted Jul 21, 2026
Patent 12667905
MANUFACTURING APPARATUS
1y 9m to grant Granted Jun 30, 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
69%
Grant Probability
89%
With Interview (+20.1%)
3y 1m (~4m remaining)
Median Time to Grant
High
PTA Risk
Based on 719 resolved cases by this examiner. Grant probability derived from career allowance rate.

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