Patent US2879690A successfully refreshed from Google Patents.
US2879690A
Expired / Lapsed
US
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Photographic exposure meters
Assignee: Daystrom Inc
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Filing: 1955-03-25
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Granted: 1959-03-31
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Expires: 1975-03-25
Abstract
No abstract record available.
Inventors
- 👤 Dunn John Frederick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:00
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)
US2363796A
Cited
US2092826A
Cited
US2147999A
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US2274441A
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US2503768A
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US2408944A
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US2389617A
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US2481678A
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US2584440A
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US2528716A
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US2529337A
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US2532417A
Cited
US2579661A
Cited
US2694956A
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US2628527A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-03-30 | 1962-09-29 | 1963-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-30 | 1966-09-29 | 1967-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-30 | 1970-09-29 | 1971-03-31 | $7700.00 | Window Closed / Lapsed |