US2860274A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical lamps
Assignee: British Thomson Houston Co Ltd
•
Filing: 1956-07-11
•
Granted: 1958-11-11
•
Expires: 1976-07-11
Abstract
No abstract record available.
Inventors
- 👤 Wright John Willoughby Thomas
- 👤 Howles Donald Arthur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:05
CPC Classifications
H; H01; H01K; H01K1/00; H01K1/40
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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US488636A
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US1893305A
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US1983362A
Cited
US2359483A
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US2542326A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-11-10 | 1962-05-12 | 1962-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-11-10 | 1966-05-12 | 1966-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-11-10 | 1970-05-12 | 1970-11-11 | $7700.00 | Window Closed / Lapsed |