Patent US1700454A successfully refreshed from Google Patents.
US1700454A
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Electron emitter and process of making the same
Assignee: AT&T Inc
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Filing: 1924-07-08
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Granted: 1929-01-29
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Expires: 1944-07-08
Abstract
No abstract record available.
Inventors
- 👤 Earle E Schumacher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:27
CPC Classifications
H; H01; H01J; H01J1/00; H01J1/02; H01J1/13; H01J1/14; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/9265; Y10S428/929; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49888; Y10T29/49908; Y10T29/49925; Y10T29/49927; Y10T29/49929; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12535; Y10T428/12583; Y10T428/1259; Y10T428/12611; Y10T428/12618; Y10T428/12771; Y10T428/12806; Y10T428/12826; Y10T428/1284; Y10T428/12986; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/294; Y10T428/2942; Y10T428/2949
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) | 1932-01-29 | 1932-07-30 | 1933-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1936-01-29 | 1936-07-30 | 1937-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1940-01-29 | 1940-07-30 | 1941-01-29 | $7700.00 | Window Closed / Lapsed |