Patent US2792469A successfully refreshed from Google Patents.
US2792469A
Expired / Lapsed
US
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Multiple electrical contactor
Assignee: WATSON ELEVATOR Co Inc
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Filing: 1952-10-20
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Granted: 1957-05-14
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Expires: 1972-10-20
Abstract
No abstract record available.
Inventors
- 👤 Clarence R Callaway
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:12
CPC Classifications
H; H01; H01H; H01H50/00; H01H50/54
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1350924A
Cited
GB308398A
Cited
US1965125A
Cited
US2115748A
Cited
DE645936C
Cited
US2136612A
Cited
US2266536A
Cited
US2269741A
Cited
CH227014A
Cited
US2585824A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-05-13 | 1960-11-12 | 1961-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-05-13 | 1964-11-12 | 1965-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-05-13 | 1968-11-12 | 1969-05-14 | $7700.00 | Window Closed / Lapsed |