US3584406A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary scarifier for railway roadbed
Assignee: Kershaw Manufacturing Co Inc
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Filing: 1969-02-18
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Granted: 1971-06-15
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Expires: 1989-02-18
Abstract
Abstract RAILROAD SCARIFYING APPARATUS HAVING A SUPPORTING FRAME MOVABLE TO SELECTED POSITIONS AND PIVOTALLY SUPPORTING A TOOL CARRYING FRAME WHICH IS MOVABLE TO LOWER AND ELEVATED POSITION. A PLURALITY OF OUTWARDLY PROJECTING TOOLS ARE CARRIED BY SHAFT MOUNTING FOR ROTATING IN A LATERALLY EXTENDING TOOL CARRYING FRAME WITH OUTER ENDS OF TOOLS CURVED IN DIRECTION OF ROTATION TO LIFT AND LOOSEN BALLAST. THE LENGTH OF TOOLS PROGRESSIVELY DECREASES TOWARD OUTER END OF SHAFT.
Inventors
- 👤 Royce G Kershaw
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:55
CPC Classifications
E; E01; E01B; E01B27/00; E01B27/02; E01B27/027
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) | 1974-06-14 | 1974-12-14 | 1975-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-14 | 1978-12-14 | 1979-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-14 | 1982-12-14 | 1983-06-15 | $7700.00 | Window Closed / Lapsed |