Patent US417357A successfully refreshed from Google Patents.
Patent US3666352A successfully refreshed from Google Patents.
US3666352A
Expired / Lapsed
US
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Rate controlled photochromic lenses of vinyl chloride-vinyl acetate copolymer containing a mercury thiocarbazone compound
Assignee: CHARLES A WAGNER
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Filing: 1970-01-22
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Granted: 1972-05-30
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Expires: 1990-01-22
Abstract
Abstract MERCURY THIOCARBAZONE COMPOUNDS DISPERSED IN A SOLIDIFIED PLASTICIZED RESIN COMPOSITION CONSISTING ESSENTIALLY OF VINYL CHLORIDE COPOLYMERIZED WITH, E.G., NOT LESS THAN 5 MOL PERCENT OF VINYL ACETATE AND LAMINATED IN A SANDWICH BETWEEN TWO TRANSPARENT GLASS OR PLASTIC LAYERS PROVIDE LENSES WITH EXTREMELY RAPID COLOR RESPONSES TO INCIDENT LIGHT AND REVERSION TO DARK-ADAPTED STATES.
Inventors
- 👤 Charles A Wagner
- 👤 Herman B Wagner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:32
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/20; G02B5/22; G02B5/23; Y; Y10; Y10S; Y10S430/00; Y10S430/155
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) | 1975-05-30 | 1975-11-29 | 1976-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-30 | 1979-11-29 | 1980-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-30 | 1983-11-29 | 1984-05-30 | $7700.00 | Window Closed / Lapsed |