Patent US3700487A successfully refreshed from Google Patents.
US3700487A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polycarbonate substrate with durable,abrasion and scratch-resistant,antifogging coating
Assignee: American Optical Corp
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Filing: 1971-02-23
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Granted: 1972-10-24
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Expires: 1991-02-23
Abstract
Abstract AT LEAST ONE SURFACE OF A SUBSTRATE, INITIALLY PREPARED TO PROVIDE ADEQUATE BONDING, IS COATED WITH A POLYVINYL ALCOHOL THAT HAS BEEN LIGHTLY CROSSLNKED TO PROVIDE A PERMANENT, ABRASION-RESISTANT ANTIFOG COATING ON THE SURFACE.
Inventors
- 👤 Harry D Crandon
- 👤 Albert R Le Boeuf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:27
CPC Classifications
C; C03; C03C; C03C17/00; C03C17/28; C03C17/32; C09; C09K; C09K3/00; C09K3/18; G; G02; G02B; G02B1/00; G02B1/10; G02B1/14; G02B1/18; G02B27/00; G02B27/0006; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31507
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) | 1975-10-24 | 1976-04-24 | 1976-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-24 | 1980-04-24 | 1980-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-24 | 1984-04-24 | 1984-10-24 | $7700.00 | Window Closed / Lapsed |