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Patent US2749407A successfully refreshed from Google Patents.
US2749407A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Single phasing preventor
Assignee: Electrical Apparatus Co Ltd
•
Filing: 1953-10-15
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Granted: 1956-06-05
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Expires: 1973-10-15
Abstract
No abstract record available.
Inventors
- 👤 Walton James Rignell
- 👤 Burke James Neil
- 👤 Cure Arnold Walton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:47
CPC Classifications
H; H01; H01H; H01H83/00; H01H83/20; H01H83/22; H01H83/223
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1910494A
Cited
GB482822A
Cited
US2199477A
Cited
GB553154A
Cited
US2495608A
Cited
US2506796A
Cited
US2584673A
Cited
US2581882A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-06-05 | 1959-12-05 | 1960-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-06-05 | 1963-12-05 | 1964-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-06-05 | 1967-12-05 | 1968-06-05 | $7700.00 | Window Closed / Lapsed |