Patent US3525135A successfully refreshed from Google Patents.
US3525135A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermionic cathode
Assignee: General Electric Co
•
Filing: 1967-12-20
•
Granted: 1970-08-25
•
Expires: 1987-12-20
Abstract
No abstract record available.
Inventors
- 👤 Ralph J Bondley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 05:14
CPC Classifications
H; H01; H01J; H01J1/00; H01J1/02; H01J1/13; H01J1/20; H01J1/28; C; C22; C22C; C22C32/00; C22C32/001; C22C32/0015; H01J9/00; H01J9/02; H01J9/04; H01J9/042; H01J9/047
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2753615A
Cited
US2848644A
Cited
US2722626A
Cited
US2881512A
Cited
US3265495A
Cited
US3269804A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-08-24 | 1974-02-23 | 1974-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-08-24 | 1978-02-23 | 1978-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-08-24 | 1982-02-23 | 1982-08-25 | $7700.00 | Window Closed / Lapsed |