Patent US3624936A successfully refreshed from Google Patents.
US3624936A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ballast regulator
Assignee: Aresco Trak Chief Pty Ltd
•
Filing: 1969-08-27
•
Granted: 1971-12-07
•
Expires: 1989-08-27
Abstract
Abstract BALLAST LEVELLING AND REGULATING DEVICE FOR LEVELLING BALLAST DUMPED ON RAIL TRACKS, THE DEVICE BEING PROVIDED WITH PLOW BLADES AND SKID PLATES WHICH CAN BE RAISED TO LOWERED, THE SKID PLATES EXTENDING IN A FORE AND AFT DIRECTION AND BEING EFFECTIVE IN PREVENTING THE DEVICE FROM TEARING OR DISLODGING THE TIES SUPPORTING THE RAILS AS THE DEVICE MOVES ALONG THE RAILS TO LEVEL THE BALLAST.
Inventors
- 👤 William James Yard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:18
CPC Classifications
E; E01; E01B; E01B27/00; E01B27/06; E01B27/10; E01B27/02; E01B27/023; E01B27/025
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1974-12-06 | 1975-06-07 | 1975-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-06 | 1979-06-07 | 1979-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-06 | 1983-06-07 | 1983-12-07 | $7700.00 | Window Closed / Lapsed |