US3570152A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crumbing tool for trenching machines
Assignee: Charles Machine Works Inc
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Filing: 1969-01-07
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Granted: 1971-03-16
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Expires: 1989-01-07
Abstract
Abstract A CRUMBING TOOL ADAPTED TO BE CONNECTED TO THE DIGGING BOOM OF A DITCHING OR TRENCHING MACHINE BY AN ADJUSTABLE FOUR-BAR LINKAGE. WHEN A DITCH IS BEING DUG, THE FOUR-BAR LINKAGE PERMITS THE CRUMBING TOOL TO ENTER THE DITCH AND FOLLOW THE DIGGING BOOM DOWN TO THE DESIRED DIGGING DEPTH. IN ADDITION, THE AMOUNT OF DOWN PRESSURE APPLIED BY THE CRUMBING TOOL AGAINST THE BOTTOM OF THE DITCH IS VARIABLE BY ADJUSTING THE RELATIONSHIP BETWEEN THE MEMBERS OF THE FOUR-BAR LINKAGE.
Inventors
- 👤 Kenneth W Schuermann
- 👤 Edwin G Malzahn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:51
CPC Classifications
E; E02; E02F; E02F3/00; E02F3/04; E02F3/08; E02F3/085; E02F3/10
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) | 1974-03-15 | 1974-09-14 | 1975-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-15 | 1978-09-14 | 1979-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-15 | 1982-09-14 | 1983-03-16 | $7700.00 | Window Closed / Lapsed |