Patent US2565542A successfully refreshed from Google Patents.
US2565542A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Peak reading vacuum tube voltmeter
Assignee: AT&T Inc
•
Filing: 1948-08-13
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Granted: 1951-08-28
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Expires: 1968-08-13
Abstract
No abstract record available.
Inventors
- 👤 Howard H Arnold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:54
CPC Classifications
G; G01; G01R; G01R19/00; G01R19/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB313208A
Cited
US2136682A
Cited
US2214915A
Cited
US2190743A
Cited
US2147446A
Cited
CH237991A
Cited
US2437449A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-08-27 | 1955-02-26 | 1955-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-08-27 | 1959-02-26 | 1959-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-08-27 | 1963-02-26 | 1963-08-28 | $7700.00 | Window Closed / Lapsed |