Patent US2816481A successfully refreshed from Google Patents.
US2816481A
Expired / Lapsed
US
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Adjustable optical prism system for producing variation in size of images in projectors and cameras
Assignee: Individual
•
Filing: 1955-03-30
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Granted: 1957-12-17
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Expires: 1975-03-30
Abstract
No abstract record available.
Inventors
- 👤 Marvin P Farley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:31
CPC Classifications
G; G02; G02B; G02B13/00; G02B13/08; G02B13/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1931992A
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US1905442A
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US1898787A
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US1932082A
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US2023217A
Cited
US2048284A
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US2375634A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-12-16 | 1961-06-17 | 1961-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-16 | 1965-06-17 | 1965-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-16 | 1969-06-17 | 1969-12-17 | $7700.00 | Window Closed / Lapsed |