US2937308A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric lamps
Assignee: British Thomson Houston Co Ltd
•
Filing: 1956-09-05
•
Granted: 1960-05-17
•
Expires: 1976-09-05
Abstract
No abstract record available.
Inventors
- 👤 Howles Donald Arthur
- 👤 Wright John Willoughby Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:53
CPC Classifications
H; H01; H01K; H01K1/00; H01K1/42; H01K1/44
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US244277A
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US268270A
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US383675A
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US2120870A
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US2204204A
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US2156048A
Cited
US2561520A
Cited
US2359483A
Cited
US2542326A
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US2802133A
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US2860502A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-05-17 | 1963-11-16 | 1964-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-17 | 1967-11-16 | 1968-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-17 | 1971-11-16 | 1972-05-17 | $7700.00 | Window Closed / Lapsed |