US2107387A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum tube with tank circuits
Assignee: AT&T Inc
•
Filing: 1936-06-12
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Granted: 1938-02-08
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Expires: 1956-06-12
Abstract
No abstract record available.
Inventors
- 👤 Potter Ralph Kimball
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:27
CPC Classifications
H; H01; H01P; H01P7/00; H01P7/04; H01J; H01J19/00; H01J19/78; H01J19/80; H01J21/00; H01J21/36; H01J25/00; H01J25/02; H01J25/04; H03; H03B; H03B9/00; H03B9/01; H03F; H03F3/00; H03F3/50; H03F3/52
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) | 1941-02-07 | 1941-08-09 | 1942-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1945-02-07 | 1945-08-09 | 1946-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1949-02-07 | 1949-08-09 | 1950-02-08 | $7700.00 | Window Closed / Lapsed |