US2666098A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum tube amplifier for measuring signals having a large variation in level
Assignee: Individual
•
Filing: 1945-12-13
•
Granted: 1954-01-12
•
Expires: 1965-12-13
Abstract
No abstract record available.
Inventors
- 👤 John L Leonard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:24
CPC Classifications
G; G01; G01R; G01R15/00; G01R15/08; G01R15/09
Claims Analysis
Total Claims: 0
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US472193A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-01-11 | 1957-07-13 | 1958-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-01-11 | 1961-07-13 | 1962-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-01-11 | 1965-07-13 | 1966-01-12 | $7700.00 | Window Closed / Lapsed |