US2667809A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exposure meter
Assignee: Weston Electric Instrument Corp
•
Filing: 1951-12-20
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Granted: 1954-02-02
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Expires: 1971-12-20
Abstract
No abstract record available.
Inventors
- 👤 Alexander T Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:55
CPC Classifications
G; G01; G01J; G01J1/00; G01J1/42
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2308469A
Cited
US2247763A
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US2353163A
Cited
GB570429A
Cited
US2556431A
Cited
US2550936A
Cited
US2482281A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-02-01 | 1957-08-03 | 1958-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-02-01 | 1961-08-03 | 1962-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-02-01 | 1965-08-03 | 1966-02-02 | $7700.00 | Window Closed / Lapsed |