Patent US2108640A successfully refreshed from Google Patents.
US2108640A
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Electron discharge apparatus
Assignee: AT&T Inc
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Filing: 1936-11-07
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Granted: 1938-02-15
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Expires: 1956-11-07
Abstract
No abstract record available.
Inventors
- 👤 Carl A Bieling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:58
CPC Classifications
H; H01; H01J; H01J21/00; H01J21/02; H01J21/04; H01J25/00; H01J25/68; H01J25/70; H01J25/74; H03; H03B; H03B9/00; H03B9/01; H03C; H03C7/00; H03C7/02
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) | 1941-02-14 | 1941-08-16 | 1942-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1945-02-14 | 1945-08-16 | 1946-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1949-02-14 | 1949-08-16 | 1950-02-15 | $7700.00 | Window Closed / Lapsed |