US2551022A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric protective system with inrush current compensation
Assignee: Allis Chalmers Corp
•
Filing: 1945-11-30
•
Granted: 1951-05-01
•
Expires: 1965-11-30
Abstract
No abstract record available.
Inventors
- 👤 Lerstrup Karl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:14
CPC Classifications
H; H02; H02H; H02H1/00; H02H1/04; H02H1/043
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB176134A
Cited
US1960083A
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US1927794A
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US2053445A
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US2027226A
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US2147781A
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US2280898A
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US2246816A
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US2319215A
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US2347714A
Cited
US2366060A
Cited
US2376808A
Cited
US2427750A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-04-30 | 1954-10-30 | 1955-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-30 | 1958-10-30 | 1959-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-30 | 1962-10-30 | 1963-05-01 | $7700.00 | Window Closed / Lapsed |