Patent US3141561A successfully refreshed from Google Patents.
US3141561A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dredger
Assignee: Individual
•
Filing: 1962-12-03
•
Granted: 1964-07-21
•
Expires: 1982-12-03
Abstract
No abstract record available.
Inventors
- 👤 Bjorklund John Bertil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:20
CPC Classifications
E; E02; E02F; E02F3/00; E02F3/04; E02F3/28; E02F3/36; E02F3/38; E02F3/382; E02F3/384; E02F3/30; E02F3/32; E02F3/42; E02F3/425
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
156 words
A DREDGER COMPRISING A HOLDER WITH A DERRICK MOUNTED THEREON WHICH IS SWINGABLE IN THE VERTICAL AND HORIZONTAL PLANE AND ON WHICH IS PIVOTALLY MOUNTED A JIB CARRYING A PIVOTALLY MOUNTED SCOOP ADAPTED TO BE ACTUATED BY A HYDRAULIC CYLINDER VIA A CROSS-LINK PIVOTALLY MOUNTED ON THE JIB AND A SECOND LINK, CHARACTERIZED IN THAT THE DERRICK AND THE JIB CAN BE OPERATED BY TWO HYDRAULIC CYLINDERS FOR SWINGING THE DERRICK IN THE VERTICAL PLANE, ONE OF THE SAID CYLINDERS MOUNTED FOR VERTICAL SWINGING IN THE HOLDER, AND THE SECOND CYLINDER MOUNTED FOR VERTICAL SWINGING ON THE DERRICK, THE PISTON ROD OF ONE OF THE SAID CYLINDERS MOUNTED IN A LINK MEANS COMPRISING TWO MEMBERS WHEREOF ONE IS IN PIVOTAL CONNECTION WITH A SECOND CROSS-LINK PIVOTALLY CARRIED ON THE DERRICK AND THE OTHER LINK MEMBER IS IN PIVOTAL CONNECTION WITH THE DERRICK, THE PISTON ROD OF THE SECOND HYDRAULIC CYLINDER BEING PIVOTALLY CONNECTED TO THE CROSS-LINK.
Claim 2
Dependent Claim
156 words
A DREDGER COMPRISING A HOLDER WITH A DERRICK MOUNTED THEREON WHICH IS SWINGABLE IN THE VERTICAL AND HORIZONTAL PLANE AND ON WHICH IS PIVOTALLY MOUNTED A JIB CARRYING A PIVOTALLY MOUNTED SCOOP ADAPTED TO BE ACTUATED BY A HYDRAULIC CYLINDER VIA A CROSS-LINK PIVOTALLY MOUNTED ON THE JIB AND A SECOND LINK, CHARACTERIZED IN THAT THE DERRICK AND THE JIB CAN BE OPERATED BY TWO HYDRAULIC CYLINDERS FOR SWINGING THE DERRICK IN THE VERTICAL PLANE, ONE OF THE SAID CYLINDERS MOUNTED FOR VERTICAL SWINGING IN THE HOLDER, AND THE SECOND CYLINDER MOUNTED FOR VERTICAL SWINGING ON THE DERRICK, THE PISTON ROD OF ONE OF THE SAID CYLINDERS MOUNTED IN A LINK MEANS COMPRISING TWO MEMBERS WHEREOF ONE IS IN PIVOTAL CONNECTION WITH A SECOND CROSS-LINK PIVOTALLY CARRIED ON THE DERRICK AND THE OTHER LINK MEMBER IS IN PIVOTAL CONNECTION WITH THE DERRICK, THE PISTON ROD OF THE SECOND HYDRAULIC CYLINDER BEING PIVOTALLY CONNECTED TO THE CROSS-LINK.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-07-21 | 1968-01-20 | 1968-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-07-21 | 1972-01-20 | 1972-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-07-21 | 1976-01-20 | 1976-07-21 | $7700.00 | Window Closed / Lapsed |