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Patent US1592272A successfully refreshed from Google Patents.
US1592272A
Expired / Lapsed
US
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Electron-discharge device
Assignee: AT&T Inc
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Filing: 1923-04-13
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Granted: 1926-07-13
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Expires: 1943-04-13
Abstract
No abstract record available.
Inventors
- 👤 Mervin J Kelly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:32
CPC Classifications
H; H01; H01J; H01J19/00; H01J19/28; H01J19/32; H01J19/34; H01J2893/00; H01J2893/0001; H01J2893/0002; H01J2893/0003; Y; Y10; Y10T; Y10T24/00; Y10T24/44; Y10T24/44641; Y10T24/44769; Y10T24/44778; Y10T24/44803; Y10T24/44812; Y10T24/44983; Y10T24/44991
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) | 1929-07-12 | 1930-01-11 | 1930-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1933-07-12 | 1934-01-11 | 1934-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1937-07-12 | 1938-01-11 | 1938-07-13 | $7700.00 | Window Closed / Lapsed |