Patent EP0144434A1 successfully refreshed from Google Patents.
US2501704A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Negative feed-back vacuum tube voltmeter
Assignee: Individual
•
Filing: 1946-02-13
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Granted: 1950-03-28
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Expires: 1966-02-13
Abstract
No abstract record available.
Inventors
- 👤 Robert G Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 17:52
CPC Classifications
G; G01; G01R; G01R19/00; G01R19/0046; G01R19/0076
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-03-27 | 1953-09-26 | 1954-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-27 | 1957-09-26 | 1958-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-27 | 1961-09-26 | 1962-03-28 | $7700.00 | Window Closed / Lapsed |