US2915935A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plural lens optical screen
Assignee: PRISMS SIGNS Inc
•
Filing: 1956-02-13
•
Granted: 1959-12-08
•
Expires: 1976-02-13
Abstract
No abstract record available.
Inventors
- 👤 Pabst Rudolf
- 👤 William E Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 07:32
CPC Classifications
G; G02; G02B; G02B3/00; G02B3/02; G02B3/08; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49787
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US592631A
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US1925096A
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US2258164A
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US2151236A
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US2268351A
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US2538638A
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US2326042A
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US2441747A
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US2716909A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-12-07 | 1963-06-08 | 1963-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-12-07 | 1967-06-08 | 1967-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-12-07 | 1971-06-08 | 1971-12-08 | $7700.00 | Window Closed / Lapsed |