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Patent US3430142A successfully refreshed from Google Patents.
US3430142A
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US
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Direct current measurement apparatus
Assignee: Spang and Co
•
Filing: 1964-11-25
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Granted: 1969-02-25
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Expires: 1984-11-25
Abstract
No abstract record available.
Inventors
- 👤 Paul W Covert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:30
CPC Classifications
G; G01; G01R; G01R19/00; G01R19/18; G01R19/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1825514A
Cited
US2157006A
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US2269584A
Cited
US2712635A
Cited
US2954519A
Cited
US3159785A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-02-25 | 1972-08-26 | 1973-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-25 | 1976-08-26 | 1977-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-25 | 1980-08-26 | 1981-02-25 | $7700.00 | Window Closed / Lapsed |