Patent US2929990A successfully refreshed from Google Patents.
US2929990A
Expired / Lapsed
US
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Voltage ratio and phase angle tester
Assignee: Individual
•
Filing: 1957-10-28
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Granted: 1960-03-22
•
Expires: 1977-10-28
Abstract
No abstract record available.
Inventors
- 👤 Martin S Maurer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:41
CPC Classifications
G; G01; G01R; G01R27/00; G01R27/28
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1684397A
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US1847127A
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US1841088A
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US2294941A
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US2309490A
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US2657352A
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US2682636A
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US2749511A
Cited
US2677101A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-03-22 | 1963-09-21 | 1964-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-03-22 | 1967-09-21 | 1968-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-03-22 | 1971-09-21 | 1972-03-22 | $7700.00 | Window Closed / Lapsed |