US2967221A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit interrupter
Assignee: Westinghouse Electric Corp
•
Filing: 1956-09-14
•
Granted: 1961-01-03
•
Expires: 1976-09-14
Abstract
No abstract record available.
Inventors
- 👤 Robert E Friedrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 23:02
CPC Classifications
H; H01; H01H; H01H33/00; H01H33/02; H01H33/04; H01H33/14; H01H75/00; H01H75/02; H01H75/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US976549A
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US2055345A
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US2163558A
Cited
US2163559A
Cited
US2223901A
Cited
US2467788A
Cited
US2507210A
Cited
US2459600A
Cited
US2534920A
Cited
US2809259A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-01-03 | 1964-07-04 | 1965-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-01-03 | 1968-07-04 | 1969-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-01-03 | 1972-07-04 | 1973-01-03 | $7700.00 | Window Closed / Lapsed |