Patent US4764164A successfully refreshed from Google Patents.
Patent US4945566A successfully refreshed from Google Patents.
US2492618A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electron discharge device
Assignee: GTE Sylvania Inc
•
Filing: 1945-03-16
•
Granted: 1949-12-27
•
Expires: 1965-03-16
Abstract
No abstract record available.
Inventors
- 👤 Robert M Bowie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:07
CPC Classifications
H; H01; H01J; H01J25/00; H01J25/02; H01J25/10; H01J25/12
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1426801A
Cited
US1581520A
Cited
US2130280A
Cited
US2167201A
Cited
US2124973A
Cited
US2157595A
Cited
GB514735A
Cited
US2284405A
Cited
US2283895A
Cited
US2408355A
Cited
US2412659A
Cited
US2416567A
Cited
US2404261A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-12-26 | 1953-06-27 | 1953-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-12-26 | 1957-06-27 | 1957-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-12-26 | 1961-06-27 | 1961-12-27 | $7700.00 | Window Closed / Lapsed |