US2357629A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rail fastening
Assignee: Colorado Fuel and Iron Corp
•
Filing: 1941-08-01
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Granted: 1944-09-05
•
Expires: 1961-08-01
Abstract
No abstract record available.
Inventors
- 👤 Marvin L Cantrell
- 👤 Frank S Shray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:04
CPC Classifications
E; E01; E01B; E01B9/00; E01B9/38; E01B9/44; E01B9/46; E01B9/48; E01B9/483
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1947-09-05 | 1948-03-06 | 1948-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1951-09-05 | 1952-03-06 | 1952-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1955-09-05 | 1956-03-06 | 1956-09-05 | $7700.00 | Window Closed / Lapsed |