Patent US2944739A successfully refreshed from Google Patents.
US2944739A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anti-creeper for railway rails
Assignee: Individual
•
Filing: 1956-11-23
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Granted: 1960-07-12
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Expires: 1976-11-23
Abstract
No abstract record available.
Inventors
- 👤 Frederick S Schwinn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:31
CPC Classifications
E; E01; E01B; E01B13/00; E01B13/02; E01B2201/00; E01B2201/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1942464A
Cited
US1888557A
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US2107131A
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US2228461A
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US2600089A
Cited
US2546046A
Cited
US2450559A
Cited
US2446495A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-07-12 | 1964-01-11 | 1964-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-07-12 | 1968-01-11 | 1968-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-07-12 | 1972-01-11 | 1972-07-12 | $7700.00 | Window Closed / Lapsed |