Patent US6221109B1 successfully refreshed from Google Patents.
US2973458A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety systems for nuclear reactors
Assignee: British Thomson Houston Co Ltd
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Filing: 1957-11-08
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Granted: 1961-02-28
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Expires: 1977-11-08
Abstract
No abstract record available.
Inventors
- 👤 Nye Anthony Edward Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:47
CPC Classifications
H; H02; H02J; H02J9/00; H02J9/04; H02J9/06; G; G21; G21C; G21C7/00; G21C7/36; Y; Y02; Y02B; Y02B70/00; Y02B70/30; Y02E; Y02E30/00; Y02E30/30; Y04; Y04S; Y04S20/00; Y04S20/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2683818A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-02-28 | 1964-08-29 | 1965-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-02-28 | 1968-08-29 | 1969-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-02-28 | 1972-08-29 | 1973-02-28 | $7700.00 | Window Closed / Lapsed |