Patent US3758448A successfully refreshed from Google Patents.
US3758448A
Expired / Lapsed
US
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Copolymers and hydrogels of unsaturated esters
Assignee: UCO OPTICS Corp
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Filing: 1971-10-05
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Granted: 1973-09-11
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Expires: 1991-10-05
Abstract
Abstract BULK POLYMERIZED, WATER INSOLUBLE BUT WATER SWELLABLE POLYMER OF MONOMERS COMPRISING WATER SOLUBLE MONOESTER OF ACRYLIC OR METHACRYLIC ACID WITH A POLYHYDRIC ALCOHOL; AND GLYCIDYL METHACRYLATE, AND/OR GLYCIDYL ACRYLATE, AND/ OR GLYCIDYL CROTONATE. THE POLYMER MAY BE SWELLED IN AQUEOUS SOLUTION TO PROVIDE A TRANSPARENT HYDROGEL HAVING EXCELLENT PHYSICAL 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 19:02
CPC Classifications
C; C08; C08F; C08F220/00; C08F220/02; C08F220/10; C08F220/20
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) | 1976-09-10 | 1977-03-12 | 1977-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-10 | 1981-03-12 | 1981-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-10 | 1985-03-12 | 1985-09-11 | $7700.00 | Window Closed / Lapsed |