US2476340A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical instrument illumination control
Assignee: United States Radium Corp
•
Filing: 1946-05-04
•
Granted: 1949-07-19
•
Expires: 1966-05-04
Abstract
No abstract record available.
Inventors
- 👤 Clarence W Wallhausen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:28
CPC Classifications
G; G02; G02B; G02B27/00; G02B27/32; G02B27/34
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US863287A
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US828511A
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US1302353A
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US1529643A
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US1436226A
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US2171571A
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US2270307A
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US2399061A
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US2403316A
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US2405026A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-07-18 | 1953-01-17 | 1953-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-07-18 | 1957-01-17 | 1957-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-07-18 | 1961-01-17 | 1961-07-19 | $7700.00 | Window Closed / Lapsed |