US2675498A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cathode for electron discharge devices
Assignee: Raytheon Co
•
Filing: 1948-12-07
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Granted: 1954-04-13
•
Expires: 1968-12-07
Abstract
No abstract record available.
Inventors
- 👤 Leo J Cronin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:28
CPC Classifications
H; H01; H01J; H01J23/00; H01J23/02; H01J23/04; H01J23/05
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US887660A
Cited
US1244216A
Cited
GB320849A
Cited
US2107945A
Cited
US2246176A
Cited
US2433821A
Cited
US2501089A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-04-12 | 1957-10-12 | 1958-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-04-12 | 1961-10-12 | 1962-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-04-12 | 1965-10-12 | 1966-04-13 | $7700.00 | Window Closed / Lapsed |