US3656993A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of coated regenerated cellulose film
Assignee: Shawmut Capital Corp
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Filing: 1970-06-04
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Granted: 1972-04-18
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Expires: 1990-06-04
Abstract
Abstract A process for preparing coated regenerated cellulose film which comprises successively softening the regenerated cellulose gelstate web with polyethylene glycol, drying the web with controlled shrinkage, coating the web and humidifying the web while permitting at least about 1/2 percent longitudinal shrinkage. The resulting coated product exhibits improved permanent shrinkage properties.
Inventors
- 👤 Bernard S Edwards
- 👤 Vernon C Haskell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:55
CPC Classifications
B; B05; B05D; B05D7/00; B05D7/02; B05D7/04
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
28 words
A process of claim 1 wherein the coated web is permitted to shrink about from 0.5 to 1.5 percent in the longitudinal direction while humidifying the coated web.
Claim 2
Dependent Claim
42 words
A process of claim 2 wherein the coated web is humidified by passing the web through an atmosphere having a dry bulb temperature of about from 80* to 90* C. and a wet bulb temperature of about from 75* to 85* C.
Claim 3
Dependent Claim
25 words
A process of claim 1 wherein the gel-state web is softened by passing through an aqueous solution of about from 5 to 10 percent plasticizer.
Claim 4
Dependent Claim
25 words
A process of claim 4 wherein the plasticizer consists of polyethylene glycol and up to about 20 percent softener selected from glycerin and polypropylene glycol.
Claim 5
Dependent Claim
45 words
A process of claim 1 wherein the gel-state web is dried in a manner such that the web is permitted to shrink up to about 3 percent in the longitudinal direction before about 60 percent of the water content of the gel-state web is removed.
References Cited (Backward Citations)
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US2182765A
Cited
US2328679A
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US3068529A
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US3515780A
Cited
US3565669A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-04-18 | 1975-10-18 | 1976-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-18 | 1979-10-18 | 1980-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-18 | 1983-10-18 | 1984-04-18 | $7700.00 | Window Closed / Lapsed |