US2252007A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermionic amplifier
Assignee: International Standard Electric Corp
•
Filing: 1939-04-05
•
Granted: 1941-08-12
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Expires: 1959-04-05
Abstract
No abstract record available.
Inventors
- 👤 Jacobsen Bent Bulow
- 👤 Roche Alleman Holly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:46
CPC Classifications
H; H04; H04B; H04B15/00; H04B15/005; H03; H03F; H03F1/00; H03F1/34; H03F1/36
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) | 1944-08-11 | 1945-02-10 | 1945-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-08-11 | 1949-02-10 | 1949-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-08-11 | 1953-02-10 | 1953-08-12 | $7700.00 | Window Closed / Lapsed |