US2993970A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum switch structure using sylphon and slotted diaphragm
Assignee: Allis Chalmers Corp
•
Filing: 1958-05-23
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Granted: 1961-07-25
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Expires: 1978-05-23
Abstract
No abstract record available.
Inventors
- 👤 Samuel T Yanagisawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:43
CPC Classifications
H; H01; H01H; H01H33/00; H01H33/60; H01H33/66; H01H33/662; H01H33/66238; H01H33/66207; H01H2033/66223; H01H33/66261
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2468768A
Cited
DE407725C
Cited
GB355535A
Cited
US1922720A
Cited
US2355951A
Cited
US2415448A
Cited
US2740915A
Cited
US2794885A
Cited
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 |