US2921636A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Railroad bed cleaning machine
Assignee: Individual
•
Filing: 1956-10-29
•
Granted: 1960-01-19
•
Expires: 1976-10-29
Abstract
No abstract record available.
Inventors
- 👤 Andres Helmut
- 👤 Hayn Ernst Von
- 👤 Roemert Eduard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:33
CPC Classifications
E; E01; E01B; E01B27/00; E01B27/06; E01B27/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1567509A
Cited
US1613420A
Cited
US1770552A
Cited
FR701498A
Cited
US2196880A
Cited
FR1073510A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-01-18 | 1963-07-20 | 1964-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-18 | 1967-07-20 | 1968-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-18 | 1971-07-20 | 1972-01-19 | $7700.00 | Window Closed / Lapsed |