US2585648A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rail track heater
Assignee: Individual
•
Filing: 1948-11-02
•
Granted: 1952-02-12
•
Expires: 1968-11-02
Abstract
No abstract record available.
Inventors
- 👤 Walter H Greenfield
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:00
CPC Classifications
E; E01; E01B; E01B7/00; E01B7/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US607136A
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US1911509A
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US492440A
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US1068533A
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US1341494A
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GB280070A
Cited
US2121903A
Cited
US2055839A
Cited
US2094069A
Cited
US2271076A
Cited
US2297059A
Cited
US2415131A
Cited
US2441242A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-02-11 | 1955-08-13 | 1956-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-02-11 | 1959-08-13 | 1960-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-02-11 | 1963-08-13 | 1964-02-12 | $7700.00 | Window Closed / Lapsed |