US1758833A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermoelectronic device
Assignee: General Electric Co
•
Filing: 1924-08-28
•
Granted: 1930-05-13
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Expires: 1944-08-28
Abstract
No abstract record available.
Inventors
- 👤 Johnson F Hendry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:38
CPC Classifications
H; H01; H01J; H01J19/00; H01J19/42; H01J2893/00; H01J2893/0001; H01J2893/0002; H01J2893/0005
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) | 1933-05-12 | 1933-11-11 | 1934-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1937-05-12 | 1937-11-11 | 1938-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1941-05-12 | 1941-11-11 | 1942-05-13 | $7700.00 | Window Closed / Lapsed |