Patent US3456453A successfully refreshed from Google Patents.
US3456453A
Expired / Lapsed
US
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Method of maintaining electrical apparatus at very low temperature
Assignee: Air Liquide SA
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Filing: 1968-03-08
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Granted: 1969-07-22
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Expires: 1988-03-08
Abstract
No abstract record available.
Inventors
- 👤 Emile Carbonell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:10
CPC Classifications
H; H02; H02K; H02K55/00; F; F25; F25B; F25B9/00; F25B9/10; H01; H01F; H01F27/00; H01F27/08; Y; Y02; Y02E; Y02E40/00; Y02E40/60; Y10; Y10S; Y10S505/00; Y10S505/825; Y10S505/888; Y10S505/899
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3199304A
Cited
US3360955A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-07-21 | 1973-01-20 | 1973-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-07-21 | 1977-01-20 | 1977-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-07-21 | 1981-01-20 | 1981-07-22 | $7700.00 | Window Closed / Lapsed |