Patent US2641726A successfully refreshed from Google Patents.
US2641726A
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US
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Electron discharge device and method of fabrication
Assignee: AT&T Inc
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Filing: 1950-04-07
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Granted: 1953-06-09
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Expires: 1970-04-07
Abstract
No abstract record available.
Inventors
- 👤 Luther E Cisne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:10
CPC Classifications
H; H01; H01J; H01J19/00; H01J19/42; H01J2893/00; H01J2893/0001; H01J2893/0002
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2076671A
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US2260264A
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US2353743A
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US2423819A
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US2428610A
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US2451517A
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US2500355A
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US2459277A
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US2493555A
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US2491995A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-08 | 1956-12-08 | 1957-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-08 | 1960-12-08 | 1961-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-08 | 1964-12-08 | 1965-06-09 | $7700.00 | Window Closed / Lapsed |