Patent US3476459A successfully refreshed from Google Patents.
US3476459A
Expired / Lapsed
US
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Optical logic system with a screen made of photochromic material
Assignee: Unisys Corp
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Filing: 1965-10-23
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Granted: 1969-11-04
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Expires: 1985-10-23
Abstract
No abstract record available.
Inventors
- 👤 Trevor D Reader
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:03
CPC Classifications
G; G02; G02F; G02F3/00; G02B; G02B5/00; G02B5/20; G02B5/22; G02B5/23
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-11-03 | 1973-05-05 | 1973-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-11-03 | 1977-05-05 | 1977-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-11-03 | 1981-05-05 | 1981-11-04 | $7700.00 | Window Closed / Lapsed |