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US2531007A
Expired / Lapsed
US
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Circuit interrupter embodying polytetrafluoroethylene
Assignee: Westinghouse Electric Corp
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Filing: 1947-03-20
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Granted: 1950-11-21
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Expires: 1967-03-20
Abstract
No abstract record available.
Inventors
- 👤 Albert P Strom
- 👤 Leo J Berberich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:10
CPC Classifications
H; H01; H01H; H01H33/00; H01H33/70; H01H33/76; H01H85/00; H01H85/02; H01H85/38; H01H85/42
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2073565A
Cited
US2155276A
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US2157832A
Cited
US2142840A
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US2243040A
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US2328825A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-11-20 | 1954-05-22 | 1954-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-11-20 | 1958-05-22 | 1958-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-11-20 | 1962-05-22 | 1962-11-21 | $7700.00 | Window Closed / Lapsed |