Patent US1840130A successfully refreshed from Google Patents.
US1840130A
Expired / Lapsed
US
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Thermionic device
Assignee: Westinghouse Electric Corp
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Filing: 1926-05-27
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Granted: 1932-01-05
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Expires: 1946-05-27
Abstract
No abstract record available.
Inventors
- 👤 Rashevsky Nicolas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:36
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/02; H01J9/04; H01J9/042; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/9265; Y10S428/929; Y10S428/9335; Y10S428/934; Y10S428/935; Y10S428/936; Y10S428/938; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12771; Y10T428/12778; Y10T428/12861; Y10T428/12944
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1935-01-04 | 1935-07-06 | 1936-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1939-01-04 | 1939-07-06 | 1940-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1943-01-04 | 1943-07-06 | 1944-01-05 | $7700.00 | Window Closed / Lapsed |