US1867959A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Incandescent cathode for thermionic tubes and method of manufacturing same
Assignee: NAAMLOOZE VENNOOTSCHAP SPLENDO
•
Filing: 1929-08-28
•
Granted: 1932-07-19
•
Expires: 1949-08-28
Abstract
No abstract record available.
Inventors
- 👤 Winter Ernst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:21
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/02; H01J9/04; H01J9/042
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) | 1935-07-19 | 1936-01-18 | 1936-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1939-07-19 | 1940-01-18 | 1940-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1943-07-19 | 1944-01-18 | 1944-07-19 | $7700.00 | Window Closed / Lapsed |