Patent US2828846A successfully refreshed from Google Patents.
Patent US1432867A successfully refreshed from Google Patents.
US1432867A
Expired / Lapsed
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Electron-discharge device and method of making the same
Assignee: AT&T Inc
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Filing: 1919-11-15
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Granted: 1922-10-24
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Expires: 1939-11-15
Abstract
No abstract record available.
Inventors
- 👤 Mervin J Kelly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 03:58
CPC Classifications
H; H01; H01J; H01J19/00; H01J2893/00; H01J2893/0001; H01J2893/0012; H01J2893/0019; H01J2893/0022; H01J2893/0023
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) | 1925-10-23 | 1926-04-24 | 1926-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1929-10-23 | 1930-04-24 | 1930-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1933-10-23 | 1934-04-24 | 1934-10-24 | $7700.00 | Window Closed / Lapsed |