Patent US3068525A successfully refreshed from Google Patents.
US3068525A
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US
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Process for the production of dimensionally stable polyvinyl resin sheeting
Assignee: EIDP Inc
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Filing: 1958-08-28
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Granted: 1962-12-18
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Expires: 1978-08-28
Abstract
No abstract record available.
Inventors
- 👤 Jr William Henry Linton
- 👤 Munger Stanley Hiram
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:09
CPC Classifications
B; B29; B29C; B29C61/00; B29C61/003; B32; B32B; B32B17/00; B32B17/06; B32B17/10; B32B17/10005; B32B17/1055; B32B17/10761; B29K; B29K2029/00; Y; Y10; Y10S; Y10S264/00; Y10S264/71
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
77 words
A PROCESS FOR THE PRODUCTION OF POLYVINYL ACETAL RESIN SHEET HAVING INCREASED DIMENSIONAL STABILITY WHICH COMPRISES: EXTRUDING POLYVINYL ACETAL RESIN IN THE FORM OF A SHEET, EQUALIZING AND PARTIALLY RELAXING THE STRESSES IN SAID FLAT SHEET UP TO ABOUT 20 PERCENT BY HEATING SAID SHEET TO A TEMPERATURE BETWEEN 80*C. AND 100*C. FOR 5 TO 15 MINUTES WHILE SAID SHEET IS MAINTAINED AT CONSTANT DIMENSIONS; SUBJECTING THE THUS PARTIALLY RELAXED SHEET TO A STRAIN RECOVERY OPERATION DURING
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-12-17 | 1966-06-18 | 1966-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-12-17 | 1970-06-18 | 1970-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-12-17 | 1974-06-18 | 1974-12-18 | $7700.00 | Window Closed / Lapsed |