Patent US2663000A successfully refreshed from Google Patents.
US2663000A
Expired / Lapsed
US
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Dual voltage switching device
Assignee: Individual
•
Filing: 1952-01-02
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Granted: 1953-12-15
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Expires: 1972-01-02
Abstract
No abstract record available.
Inventors
- 👤 Keith Hubert Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:24
CPC Classifications
H; H01; H01H; H01H19/00; H01H19/54; H01H19/56; H01H19/58; H01H1/00; H01H1/12; H01H1/14; H01H1/16; H01H9/00; H01H9/0005; H01H9/0011
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US682729A
Cited
US1123321A
Cited
US1094534A
Cited
FR573170A
Cited
US1895096A
Cited
US2445434A
Cited
US2552028A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-12-14 | 1957-06-15 | 1957-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-12-14 | 1961-06-15 | 1961-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-12-14 | 1965-06-15 | 1965-12-15 | $7700.00 | Window Closed / Lapsed |