Patent US2553478A successfully refreshed from Google Patents.
US2553478A
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US
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Rotary electromagnetic transfer switch
Assignee: Arrow Hart and Hegeman Electric Co
•
Filing: 1944-10-26
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Granted: 1951-05-15
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Expires: 1964-10-26
Abstract
No abstract record available.
Inventors
- 👤 Harold E Schleicher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:12
CPC Classifications
H; H01; H01H; H01H19/00; H01H19/54; H01H19/56; H01H50/00; H01H50/16; H01H50/18; H01H50/24
Claims Analysis
Total Claims: 0
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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) | 1954-05-14 | 1954-11-13 | 1955-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-14 | 1958-11-13 | 1959-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-14 | 1962-11-13 | 1963-05-15 | $7700.00 | Window Closed / Lapsed |