US1514898A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermionic device
Assignee: Individual
•
Filing: 1923-07-18
•
Granted: 1924-11-11
•
Expires: 1943-07-18
Abstract
No abstract record available.
Inventors
- 👤 George L Geisey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 18:54
CPC Classifications
H; H01; H01J; H01J19/00; H01J19/28; H01J2893/00; H01J2893/0001; H01J2893/0012; Y; Y10; Y10T; Y10T83/00; Y10T83/04; Y10T83/0505
Claims Analysis
Total Claims: 0
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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) | 1927-11-11 | 1928-05-12 | 1928-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1931-11-11 | 1932-05-12 | 1932-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1935-11-11 | 1936-05-12 | 1936-11-11 | $7700.00 | Window Closed / Lapsed |