Patent US2016152A successfully refreshed from Google Patents.
US2016152A
Expired / Lapsed
US
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Electron discharge device with indirectly heated cathode
Assignee: Westinghouse Lamp Co
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Filing: 1928-07-12
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Granted: 1935-10-01
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Expires: 1948-07-12
Abstract
No abstract record available.
Inventors
- 👤 Marden John Wesley
- 👤 Lederer Ernest Anton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:49
CPC Classifications
H; H01; H01J; H01J21/00; H01J21/02; H01J1/00; H01J1/02; H01J1/13; H01J1/20; H01J19/00; H01J19/02; H01J2893/00; H01J2893/0001
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) | 1938-09-30 | 1939-04-01 | 1939-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1942-09-30 | 1943-04-01 | 1943-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1946-09-30 | 1947-04-01 | 1947-10-01 | $7700.00 | Window Closed / Lapsed |