US2822492A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electron discharge devices
Assignee: International Standard Electric Corp
•
Filing: 1954-08-10
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Granted: 1958-02-04
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Expires: 1974-08-10
Abstract
No abstract record available.
Inventors
- 👤 Peter Francis Conway Burke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:55
CPC Classifications
H; H01; H01J; H01J3/00; H01J3/02; H01J3/027; H01F; H01F7/00; H01F7/02; H01J23/00; H01J23/02; H01J23/06; H01J23/065; H01J23/08; H01J23/087; H01J23/0873; H01J25/00; H01J25/34; H01J25/36; H01J25/38
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2202588A
Cited
US2510267A
Cited
US2540621A
Cited
US2687490A
Cited
US2608668A
Cited
US2683831A
Cited
US2740913A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-02-03 | 1961-08-05 | 1962-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-02-03 | 1965-08-05 | 1966-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-02-03 | 1969-08-05 | 1970-02-04 | $7700.00 | Window Closed / Lapsed |