US2853775A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preventing shelling in railroad rails
Assignee: Individual
•
Filing: 1955-03-31
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Granted: 1958-09-30
•
Expires: 1975-03-31
Abstract
No abstract record available.
Inventors
- 👤 Harcourt C Drake
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 01:22
CPC Classifications
E; E01; E01B; E01B31/00; E01B31/02; E01B31/12; E01B5/00; Y; Y10; Y10S; Y10S72/00; Y10S72/701; Y10T; Y10T29/00; Y10T29/49; Y10T29/49718; Y10T29/49748; Y10T29/49995; Y10T29/49996
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-09-29 | 1962-03-31 | 1962-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-29 | 1966-03-31 | 1966-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-29 | 1970-03-31 | 1970-09-30 | $7700.00 | Window Closed / Lapsed |