Patent US2981941A successfully refreshed from Google Patents.
US2981941A
Expired / Lapsed
US
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Selective optical screen and system
Assignee: Unisys Corp
•
Filing: 1956-08-22
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Granted: 1961-04-25
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Expires: 1976-08-22
Abstract
No abstract record available.
Inventors
- 👤 James A Ogle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:03
CPC Classifications
G; G09; G09F; G09F9/00; G09F9/40; G09F9/405
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2351034A
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US2371172A
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US1072426A
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US1223459A
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US1984471A
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US2164528A
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US2500511A
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US2639918A
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US2751584A
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US2787785A
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US2794977A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-24 | 1964-10-24 | 1965-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-24 | 1968-10-24 | 1969-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-24 | 1972-10-24 | 1973-04-25 | $7700.00 | Window Closed / Lapsed |