US2889434A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Switching device
Assignee: Westinghouse Electric Corp
•
Filing: 1956-04-09
•
Granted: 1959-06-02
•
Expires: 1976-04-09
Abstract
No abstract record available.
Inventors
- 👤 Harry J Lingal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:53
CPC Classifications
H; H01; H01H; H01H33/00; H01H33/02; H01H33/04; H01H33/12; H01H33/121; H01H33/125; H01H33/126; H01H1/00; H01H1/12; H01H1/14; H01H1/16; H01H3/00; H01H3/22; H01H3/30; H01H33/53; H01H33/56; H01H33/565; H01H33/60; H01H33/64; H01H33/70; H01H33/88; H01H33/90; H01H33/91
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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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) | 1962-06-01 | 1962-12-01 | 1963-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-06-01 | 1966-12-01 | 1967-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-06-01 | 1970-12-01 | 1971-06-02 | $7700.00 | Window Closed / Lapsed |