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Patent US3644594A successfully refreshed from Google Patents.
US3644594A
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Polyvinyl acetal interlayers containing copolymeric additives
Assignee: Monsanto Co
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Filing: 1969-04-22
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Granted: 1972-02-22
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Expires: 1989-04-22
Abstract
Abstract DISCLOSED HEREIN ARE POLYVINYL ACETAL INTERLAYERS HAVING IMPROVED IMPACT STRENGTH WHICH CONTAIN FROM 0.5 TO 5.0 PARTS PER HUNDRED PARTS OF POLYVINYL ACETAL RESIN (PHR.) OF AN ADDITIVE WHICH IS THE COPOLYMERIZATION PRODUCT OF AT LEAST ONE VINYL ESTER AND AT LEAST ONE ESTER OF ACRYLIC METHACRYLIC ACID.
Inventors
- 👤 George E Mont
- 👤 Saul M Cohen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:24
CPC Classifications
C; C08; C08L; C08L29/00; C08L29/14; B; B32; B32B; B32B17/00; B32B17/06; B32B17/10; B32B17/10005; B32B17/1055; B32B17/10605; B32B17/10761
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-02-21 | 1975-08-23 | 1976-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-21 | 1979-08-23 | 1980-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-21 | 1983-08-23 | 1984-02-22 | $7700.00 | Window Closed / Lapsed |