Patent US2298694A successfully refreshed from Google Patents.
US2870366A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric discharge tube of the kind comprising a cathode of the indirectly heated type
Assignee: US Philips Corp
•
Filing: 1952-10-01
•
Granted: 1959-01-20
•
Expires: 1972-10-01
Abstract
No abstract record available.
Inventors
- 👤 Hendrikus Johannes Marie V Tol
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:30
CPC Classifications
H; H01; H01J; H01J1/00; H01J1/02; H01J1/13; H01J1/20; C; C10; C10G; C10G45/00; C10G45/02
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-01-19 | 1962-07-21 | 1963-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-01-19 | 1966-07-21 | 1967-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-01-19 | 1970-07-21 | 1971-01-20 | $7700.00 | Window Closed / Lapsed |