Patent US1937201A successfully refreshed from Google Patents.
US1937201A
Expired / Lapsed
US
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Thermionic tube
Assignee: UNION NAT BANK OF PITTSBURGH
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Filing: 1926-05-01
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Granted: 1933-11-28
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Expires: 1946-05-01
Abstract
No abstract record available.
Inventors
- 👤 Frederick S Mccullough
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:04
CPC Classifications
G; G10; G10H; G10H3/00; G10H3/03; G10H3/06; H; H01; H01J; H01J21/00; H01J21/02
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) | 1936-11-27 | 1937-05-29 | 1937-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1940-11-27 | 1941-05-29 | 1941-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1944-11-27 | 1945-05-29 | 1945-11-28 | $7700.00 | Window Closed / Lapsed |