Patent US3042859A successfully refreshed from Google Patents.
US3042859A
Expired / Lapsed
US
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Capacitance measuring circuit
Assignee: AT&T Inc
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Filing: 1957-03-13
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Granted: 1962-07-03
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Expires: 1977-03-13
Abstract
No abstract record available.
Inventors
- 👤 Harry R Shillington
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:26
CPC Classifications
G; G01; G01R; G01R27/00; G01R27/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2177569A
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US2436872A
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US2504848A
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US2743418A
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US2544685A
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US2596396A
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US2455543A
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US2601491A
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US2806205A
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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) | 1965-07-02 | 1966-01-01 | 1966-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-07-02 | 1970-01-01 | 1970-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-07-02 | 1974-01-01 | 1974-07-03 | $7700.00 | Window Closed / Lapsed |