Patent US4155356A successfully refreshed from Google Patents.
US2085605A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermionic cathode for electric discharge devices
Assignee: General Electric Co
•
Filing: 1935-04-30
•
Granted: 1937-06-29
•
Expires: 1955-04-30
Abstract
No abstract record available.
Inventors
- 👤 Ramsay Henry Thomas
- 👤 Rooksby Harold Percy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 04:17
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/04; H01J61/06; H01J61/067; H01J61/0675; H01J61/0677
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1940-06-28 | 1940-12-28 | 1941-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1944-06-28 | 1944-12-28 | 1945-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1948-06-28 | 1948-12-28 | 1949-06-29 | $7700.00 | Window Closed / Lapsed |