US3445162A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for automatically controlling the exposure time for photographic enlarging devices
Assignee: Individual
•
Filing: 1967-01-13
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Granted: 1969-05-20
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Expires: 1987-01-13
Abstract
No abstract record available.
Inventors
- 👤 Walter Klatt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:37
CPC Classifications
G; G03; G03B; G03B27/00; G03B27/72; G03B27/722
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-05-19 | 1972-11-18 | 1973-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-05-19 | 1976-11-18 | 1977-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-05-19 | 1980-11-18 | 1981-05-20 | $7700.00 | Window Closed / Lapsed |