US3449672A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nonphase-sensitive summary and averaging a.c. voltmeter
Assignee: EDWARD V THOMAS
•
Filing: 1963-11-27
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Granted: 1969-06-10
•
Expires: 1983-11-27
Abstract
No abstract record available.
Inventors
- 👤 Edward V Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:39
CPC Classifications
G; G01; G01R; G01R19/00; G01R19/22; G01R15/00; G01R15/005; G01R19/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2244369A
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FR879138A
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US2521522A
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US2575073A
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US2763837A
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US2903524A
Cited
GB860681A
Cited
US2980867A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-09 | 1972-12-09 | 1973-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-09 | 1976-12-09 | 1977-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-09 | 1980-12-09 | 1981-06-10 | $7700.00 | Window Closed / Lapsed |