US2572201A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of hardening the ends of railroad rails
Assignee: Airco Inc
•
Filing: 1948-02-10
•
Granted: 1951-10-23
•
Expires: 1968-02-10
Abstract
No abstract record available.
Inventors
- 👤 Rooke Robert Marton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:47
CPC Classifications
C; C21; C21D; C21D9/00; C21D9/04; C21D2221/00; C21D2221/01
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US153115A
Cited
US1418985A
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US1828325A
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US1846684A
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US2129670A
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US2170876A
Cited
US2182120A
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US2309518A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-10-22 | 1955-04-23 | 1955-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-10-22 | 1959-04-23 | 1959-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-10-22 | 1963-04-23 | 1963-10-23 | $7700.00 | Window Closed / Lapsed |