Patent US2932966A successfully refreshed from Google Patents.
US2932966A
Expired / Lapsed
US
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Apparatus for smoke detection
Assignee: British Thomson Houston Co Ltd
•
Filing: 1957-05-14
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Granted: 1960-04-19
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Expires: 1977-05-14
Abstract
No abstract record available.
Inventors
- 👤 Grindell Duncan Holmes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:54
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/60; G08; G08B; G08B17/00; G08B17/10; G08B17/11; G08B17/113; H; H01; H01S; H01S3/00; H01S3/02; H01S3/03; H01S3/038; Y; Y10; Y10S; Y10S55/00; Y10S55/38
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1168227A
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US1274415A
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US2307602A
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US2346690A
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US2543141A
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US2484202A
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US2684008A
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US2649707A
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US2722284A
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US2777535A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-04-19 | 1963-10-19 | 1964-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-19 | 1967-10-19 | 1968-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-19 | 1971-10-19 | 1972-04-19 | $7700.00 | Window Closed / Lapsed |