Patent US2755014A successfully refreshed from Google Patents.
US2755014A
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US
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Ionic vacuum pump device
Assignee: General Electric Co
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Filing: 1953-04-24
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Granted: 1956-07-17
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Expires: 1973-04-24
Abstract
No abstract record available.
Inventors
- 👤 Willem F Westendorp
- 👤 Anatole M Gurewitsch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:54
CPC Classifications
H; H01; H01J; H01J41/00; H01J41/12; H01J41/18; H01J41/20; H01J41/14; H01J41/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2636664A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-07-17 | 1960-01-16 | 1960-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-07-17 | 1964-01-16 | 1964-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-07-17 | 1968-01-16 | 1968-07-17 | $7700.00 | Window Closed / Lapsed |