US4160798A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Release coatings
Assignee: Warren SD Co
•
Filing: 1977-05-09
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Granted: 1979-07-10
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Expires: 1997-05-09
Abstract
Abstract Release paper provided with a coating comprising a copolymer of an aliphatic 1-olefin and maleic anhydride, preferably hydrolyzed with a monovalent cationic hydroxide.
Inventors
- 👤 Lawrence Price
- 👤 Mose A. Russo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:46
CPC Classifications
D; D21; D21H; D21H19/00; D21H19/10; D21H19/12; B; B29; B29C; B29C33/00; B29C33/56; B29C33/60; B29C33/62; B29C48/00; B29C48/03; B29C48/07; B29C48/08; B29C48/25; B29C48/88; B29C48/911; B29C48/9135; B29C48/9175; B29C33/68; B29C39/00; Y; Y10; Y10S; Y10S264/00; Y10S264/60
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
89 words
In a method of forming a film of resinous material which includes the step of casting the film of resinous material in a flowable state onto a piece of paper having an easy release surface, drying the resinous film material and stripping it from the release surface, the improvement which comprises casting the film of resinous material onto a piece of paper having a release coating comprising a copolymer of an aliphatic 1-olefin having from 6 to 50 carbon atoms per molecule and maleic anhydride hydrolyzed with potassium hydroxide.
Claim 2
Dependent Claim
89 words
In a method of forming a film of resinous material which includes the step of casting the film of resinous material in a flowable state onto a piece of paper having an easy release surface, drying the resinous film material and stripping it from the release surface, the improvement which comprises casting the film of resinous material onto a piece of paper having a release coating comprising a copolymer of an aliphatic 1-olefin having from 6 to 50 carbon atoms per molecule and maleic anhydride hydrolyzed with potassium hydroxide.
Claim 3
Dependent Claim
11 words
The method of claim 1, wherein the aliphatic 1-olefin is 1-octadecene.
Claim 4
Dependent Claim
14 words
The method of claim 1, wherein the resinous film material is polyvinyl chloride plastisol.
Claim 5
Dependent Claim
12 words
The method of claim 2, wherein the resinous film material is polyurethane.
References Cited (Backward Citations)
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US3560456A
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US3826677A
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US3898114A
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US3928707A
Cited
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Cited
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Cited
US4076666A
Cited
US4117198A
Cited
US4118541A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-07-09 | 1983-01-08 | 1983-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-07-09 | 1987-01-08 | 1987-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-07-09 | 1991-01-08 | 1991-07-10 | $7700.00 | Window Closed / Lapsed |