Patent US3381842A successfully refreshed from Google Patents.
US3381842A
Expired / Lapsed
US
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Sealed evacuated tank
Assignee: Societe Generale de Constructions Electriques et Mecaniques
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Filing: 1965-10-15
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Granted: 1968-05-07
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Expires: 1985-10-15
Abstract
No abstract record available.
Inventors
- 👤 Henri Paul Vayson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:55
CPC Classifications
H; H01; H01F; H01F6/00; F; F17; F17C; F17C13/00; F17C3/00; H02; H02K; H02K55/00; F17C2209/00; F17C2209/21; F17C2209/2154; F17C2209/2163; Y; Y02; Y02E; Y02E40/00; Y02E40/60
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2350271A
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US2744043A
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US2639833A
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US2848133A
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US3002534A
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US2991808A
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US3073475A
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US3106313A
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US3215576A
Cited
US3296802A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-05-07 | 1971-11-06 | 1972-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-05-07 | 1975-11-06 | 1976-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-05-07 | 1979-11-06 | 1980-05-07 | $7700.00 | Window Closed / Lapsed |