US3445170A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photoelectric exposure meter
Assignee: Zeiss Ikon AG
•
Filing: 1965-01-04
•
Granted: 1969-05-20
•
Expires: 1985-01-04
Abstract
No abstract record available.
Inventors
- 👤 Rolf Dietrich
- 👤 Dirk Ulffers
- 👤 Hans Warstat
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:47
CPC Classifications
G; G01; G01J; G01J1/00; G01J1/42; G01J1/4209; G01J1/4214
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US426009A
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US661456A
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US1739373A
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US2091762A
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US3180209A
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US3133703A
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US3085149A
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US3147680A
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US3224350A
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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) | 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 |