US2999180A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric lamps
Assignee: British Thomson Houston Co Ltd
•
Filing: 1957-07-11
•
Granted: 1961-09-05
•
Expires: 1977-07-11
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
2026-10-25 19:04
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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US2899671A
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US2053138A
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US2134472A
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US2204204A
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US2561520A
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US2359483A
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US2542326A
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US2699659A
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US2880349A
Cited
US2860502A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-09-04 | 1965-03-06 | 1965-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-09-04 | 1969-03-06 | 1969-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-09-04 | 1973-03-06 | 1973-09-05 | $7700.00 | Window Closed / Lapsed |