Patent US2470412A successfully refreshed from Google Patents.
US2470412A
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Alternating current impedance meter
Assignee: Phillips Petroleum Co
•
Filing: 1943-12-07
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Granted: 1949-05-17
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Expires: 1963-12-07
Abstract
No abstract record available.
Inventors
- 👤 Raymond G Piety
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:07
CPC Classifications
G; G01; G01R; G01R27/00; G01R27/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1660405A
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US1728835A
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US2171536A
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US2223840A
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US2230297A
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US2287174A
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US2232792A
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US2277000A
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US2376394A
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US2294659A
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US2335265A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-05-16 | 1952-11-15 | 1953-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-05-16 | 1956-11-15 | 1957-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-05-16 | 1960-11-15 | 1961-05-17 | $7700.00 | Window Closed / Lapsed |