Patent US2640890A successfully refreshed from Google Patents.
US2640890A
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US
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Multipositioned liquid switch
Assignee: Individual
•
Filing: 1950-04-28
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Granted: 1953-06-02
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Expires: 1970-04-28
Abstract
No abstract record available.
Inventors
- 👤 Howard R Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:08
CPC Classifications
H; H01; H01H; H01H29/00; H01H29/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB133880A
Cited
US1010620A
Cited
US1226546A
Cited
GB125900A
Cited
US1783279A
Cited
GB297769A
Cited
GB369903A
Cited
US1998822A
Cited
US2147506A
Cited
US2506763A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-01 | 1956-12-01 | 1957-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-01 | 1960-12-01 | 1961-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-01 | 1964-12-01 | 1965-06-02 | $7700.00 | Window Closed / Lapsed |