Patent US3898114A successfully refreshed from Google Patents.
US3898114A
Expired / Lapsed
US
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Release paper for use in forming plastic laminates
Assignee: Warren SD Co
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Filing: 1974-03-11
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Granted: 1975-08-05
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Expires: 1994-03-11
Abstract
Abstract A release paper for use in laminating acrylic and polyester sheets having a release coating comprising poly(vinyl alcohol) and methyl cellulose.
Inventors
- 👤 Franklin J Ward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:23
CPC Classifications
D; D21; D21H; D21H27/00; D21H27/001; B; B44; B44C; B44C5/00; B44C5/04; D21H19/00; D21H19/10; D21H19/12; Y; Y10; Y10T; Y10T428/00; Y10T428/14; Y10T428/1476
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
71 words
IN A METHOD OF LAMINATING SHEETS OF ACRYLIC OR POLYESTER RESINS WHICH INCLUDES THE STEP OF PRESSING A SHEET OF RESIN AGAINST A PIECE OF PAPER HAVING AN EASY-RELEASE SURFACE, THE IMPROVEMENT WHICH COMPRISES PRESSING THE SHEET AGAINST A PIECE OF PAPER HAVING A RELEASE COATING COMPRISING POLY(VINYL ALCOHOL) AND FROM AN EFFECTIVE AMOUNT GREATER THAN 0.01 UP TO 20% OF METHYL CELLULOSE BASED ON THE WEIGHT OF THE POLY(VINYL ALCOHOL).
Claim 2
Dependent Claim
71 words
IN A METHOD OF LAMINATING SHEETS OF ACRYLIC OR POLYESTER RESINS WHICH INCLUDES THE STEP OF PRESSING A SHEET OF RESIN AGAINST A PIECE OF PAPER HAVING AN EASY-RELEASE SURFACE, THE IMPROVEMENT WHICH COMPRISES PRESSING THE SHEET AGAINST A PIECE OF PAPER HAVING A RELEASE COATING COMPRISING POLY(VINYL ALCOHOL) AND FROM AN EFFECTIVE AMOUNT GREATER THAN 0.01 UP TO 20% OF METHYL CELLULOSE BASED ON THE WEIGHT OF THE POLY(VINYL ALCOHOL).
Claim 3
Dependent Claim
18 words
The method in accordance with claim 1 wherein the release coating comprises from 2 to 20% methyl cellulose.
Claim 4
Dependent Claim
18 words
The method in accordance with claim 1 wherein the release coating comprises from 5 to 20% methyl cellulose.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-04 | 1979-02-03 | 1979-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-04 | 1983-02-03 | 1983-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-04 | 1987-02-03 | 1987-08-05 | $7700.00 | Window Closed / Lapsed |