US2666895A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and apparatus for the calibration of instrument current transformers
Assignee: LOUISE B KNOPP
•
Filing: 1945-09-26
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Granted: 1954-01-19
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Expires: 1965-09-26
Abstract
No abstract record available.
Inventors
- 👤 Otto A Knopp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:11
CPC Classifications
G; G01; G01R; G01R1/00; G01R1/28
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1395306A
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US1815217A
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US1819714A
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US1778832A
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US1795607A
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US1972243A
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US2410386A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-01-18 | 1957-07-20 | 1958-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-01-18 | 1961-07-20 | 1962-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-01-18 | 1965-07-20 | 1966-01-19 | $7700.00 | Window Closed / Lapsed |