US2590916A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical focusing and illuminating device for photographic cameras and the like
Assignee: Individual
•
Filing: 1950-08-10
•
Granted: 1952-04-01
•
Expires: 1970-08-10
Abstract
No abstract record available.
Inventors
- 👤 Frank G Back
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:21
CPC Classifications
G; G03; G03B; G03B13/00; G03B13/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1760208A
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US2006007A
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US1960722A
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US2148574A
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US2146506A
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US2235355A
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US2239379A
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US2244409A
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US2241300A
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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) | 1955-04-01 | 1955-10-01 | 1956-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-04-01 | 1959-10-01 | 1960-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-04-01 | 1963-10-01 | 1964-04-01 | $7700.00 | Window Closed / Lapsed |