Patent FR2551783A1 successfully refreshed from Google Patents.
US2998544A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetron cathode
Assignee: Litton Electron Tube Corp
•
Filing: 1958-02-28
•
Granted: 1961-08-29
•
Expires: 1978-02-28
Abstract
No abstract record available.
Inventors
- 👤 Paul W Crapuchettes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 08:24
CPC Classifications
H; H01; H01J; H01J23/00; H01J23/02; H01J23/04; H01J23/05
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2526054A
Cited
US2283896A
Cited
US2456649A
Cited
US2450763A
Cited
US2474898A
Cited
US2462858A
Cited
US2479193A
Cited
US2480999A
Cited
US2518848A
Cited
US2557780A
Cited
US2497436A
Cited
US2846618A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-08-28 | 1965-02-27 | 1965-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-28 | 1969-02-27 | 1969-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-28 | 1973-02-27 | 1973-08-29 | $7700.00 | Window Closed / Lapsed |