US2977531A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Insulation test circuit
Assignee: Westinghouse Electric Corp
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Filing: 1958-11-18
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Granted: 1961-03-28
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Expires: 1978-11-18
Abstract
No abstract record available.
Inventors
- 👤 Karl R Humes
- 👤 Joseph G Schwarckopf
- 👤 Frederick H Rohr
- 👤 Marshall P White
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:03
CPC Classifications
G; G01; G01R; G01R27/00; G01R27/02; G01R27/025
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-03-27 | 1964-09-26 | 1965-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-27 | 1968-09-26 | 1969-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-27 | 1972-09-26 | 1973-03-28 | $7700.00 | Window Closed / Lapsed |