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US2805599A
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US
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Optical contrast amplifier
Assignee: Individual
•
Filing: 1954-04-09
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Granted: 1957-09-10
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Expires: 1974-04-09
Abstract
No abstract record available.
Inventors
- 👤 Pajes Wolf Szmul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 04:46
CPC Classifications
G; G02; G02B; G02B27/00; G02B27/50; G03; G03B; G03B35/00; G03B35/18; G03B35/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2256855A
Cited
US2362235A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-09 | 1961-03-11 | 1961-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-09 | 1965-03-11 | 1965-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-09 | 1969-03-11 | 1969-09-10 | $7700.00 | Window Closed / Lapsed |