US2993971A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum switch having arcuate tubular contacts actuated by internal fluid pressure
Assignee: Allis Chalmers Corp
•
Filing: 1958-12-19
•
Granted: 1961-07-25
•
Expires: 1978-12-19
Abstract
No abstract record available.
Inventors
- 👤 Herbert M Pflanz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:55
CPC Classifications
H; H01; H01H; H01H35/00; H01H35/24; H01H35/36
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1676921A
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US1865082A
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FR638489A
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GB287843A
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US1875957A
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US2177200A
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US2356174A
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US2741735A
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US2823543A
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US2764651A
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US2810800A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-24 | 1965-01-23 | 1965-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-24 | 1969-01-23 | 1969-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-24 | 1973-01-23 | 1973-07-25 | $7700.00 | Window Closed / Lapsed |