Patent US3056022A successfully refreshed from Google Patents.
US3056022A
Expired / Lapsed
US
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Automatic car retarder control system for railroads
Assignee: SPX Technologies Inc
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Filing: 1957-03-29
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Granted: 1962-09-25
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Expires: 1977-03-29
Abstract
No abstract record available.
Inventors
- 👤 Stuart M Phelps
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:14
CPC Classifications
B; B61; B61K; B61K7/00; B61K7/02; B61K7/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1586989A
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US2539014A
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US2658139A
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US2700728A
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US2693593A
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US2731632A
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US2806685A
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US2727138A
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GB756499A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-09-24 | 1966-03-26 | 1966-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-09-24 | 1970-03-26 | 1970-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-09-24 | 1974-03-26 | 1974-09-25 | $7700.00 | Window Closed / Lapsed |