US3057256A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical screen
Assignee: Individual
•
Filing: 1956-06-08
•
Granted: 1962-10-09
•
Expires: 1976-06-08
Abstract
No abstract record available.
Inventors
- 👤 Richard T Erban
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:24
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/12; G02B5/122; G02B5/124
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2380447A
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US1610423A
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US1666808A
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US1591572A
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US1950560A
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US1970358A
Cited
US2161842A
Cited
US2538638A
Cited
US2588373A
Cited
US2622220A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-10-08 | 1966-04-09 | 1966-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-10-08 | 1970-04-09 | 1970-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-10-08 | 1974-04-09 | 1974-10-09 | $7700.00 | Window Closed / Lapsed |