US2660688A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electron discharge device
Assignee: AT&T Inc
•
Filing: 1951-03-09
•
Granted: 1953-11-24
•
Expires: 1971-03-09
Abstract
No abstract record available.
Inventors
- 👤 Edward J Walsh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:31
CPC Classifications
H; H01; H01J; H01J21/00; H01J21/36
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USRE15278E
Cited
US2090006A
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US2301914A
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US2406827A
Cited
US2413006A
Cited
US2415360A
Cited
US2503806A
Cited
US2461303A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-11-23 | 1957-05-25 | 1957-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-23 | 1961-05-25 | 1961-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-23 | 1965-05-25 | 1965-11-24 | $7700.00 | Window Closed / Lapsed |