Patent US2452157A successfully refreshed from Google Patents.
US2452157A
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Electron discharge apparatus
Assignee: AT&T Inc
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Filing: 1947-07-10
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Granted: 1948-10-26
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Expires: 1967-07-10
Abstract
No abstract record available.
Inventors
- 👤 Raymond W Sears
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:06
CPC Classifications
H; H01; H01J; H01J31/00; H01J31/02; H01J31/06; H04; H04J; H04J3/00; H04J3/02; H04J3/04; H04J3/045; H04Q; H04Q3/00; H04Q3/42; H04Q3/52; H04Q3/525
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) | 1951-10-26 | 1952-04-26 | 1952-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-10-26 | 1956-04-26 | 1956-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-10-26 | 1960-04-26 | 1960-10-26 | $7700.00 | Window Closed / Lapsed |