Patent US3437768A successfully refreshed from Google Patents.
US3437768A
Expired / Lapsed
US
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Drawout switchgear optionally interlocked with an auxiliary switch
Assignee: Westinghouse Electric Corp
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Filing: 1967-09-18
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Granted: 1969-04-08
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Expires: 1987-09-18
Abstract
No abstract record available.
Inventors
- 👤 Robert D Miller
- 👤 Gordon G Gernhardt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:47
CPC Classifications
H; H02; H02B; H02B11/00; H02B11/12; H02B11/127; H02B11/133; H01; H01H; H01H9/00; H01H9/0066
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2554510A
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US2573485A
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US2703829A
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US2858389A
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US2921998A
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GB911156A
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US3188413A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-04-07 | 1972-10-07 | 1973-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-07 | 1976-10-07 | 1977-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-07 | 1980-10-07 | 1981-04-08 | $7700.00 | Window Closed / Lapsed |