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US3787380A
Expired / Lapsed
US
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Polymers of n-vinyl or n-allyl hetero-cyclic compounds with monoethyl-enically unsaturated esters and gly-cidyl esters
Assignee: CooperVision Inc
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Filing: 1971-10-05
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Granted: 1974-01-22
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Expires: 1991-10-05
Abstract
Abstract WATER INSOLUBLE BUT WATER SWELLABLE POLYMER COMPRISING CERTAIN N-VINYL OR N-ALLYL HETEROCYCLIC COMPOUNDS: AN UNSATURATED ESTER, AND GLYCIDYL METHACRYLATE, AND/OR GLYCIDYL ACRYLATE AND/OR GLYCIDYL CROTONATE. TH POLYMER MAY BE SWELLED IN AQUEOUS SOLUTIONS TO PROVIDE A TRANSPARENT HYDROEL HAVING EXCELLENT PHYSICAL AND OPTICAL PROPERTIES. AND SUITABLE IN AN OPHTHALMIC LENS.
Inventors
- 👤 P Stamberger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:39
CPC Classifications
C; C08; C08F; C08F26/00; C08F26/06; G; G02; G02B; G02B1/00; G02B1/04; G02B1/041; G02B1/043
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) | 1977-01-21 | 1977-07-23 | 1978-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-21 | 1981-07-23 | 1982-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-21 | 1985-07-23 | 1986-01-22 | $7700.00 | Window Closed / Lapsed |