US2445771A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electron discharge device of the velocity modulation type
Assignee: STC PLC
•
Filing: 1942-10-14
•
Granted: 1948-07-27
•
Expires: 1962-10-14
Abstract
No abstract record available.
Inventors
- 👤 Fremlin John Heaver
- 👤 Strachey Christopher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 01:53
CPC Classifications
H; H01; H01J; H01J25/00; H01J25/02; H01J25/22; H01J25/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2235497A
Cited
US2124270A
Cited
US2190712A
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US2190515A
Cited
US2250511A
Cited
US2259690A
Cited
US2320860A
Cited
US2278210A
Cited
US2293151A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-07-27 | 1952-01-26 | 1952-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-07-27 | 1956-01-26 | 1956-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-07-27 | 1960-01-26 | 1960-07-27 | $7700.00 | Window Closed / Lapsed |