Patent US3117686A successfully refreshed from Google Patents.
US3117686A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Back hoe excavator
Assignee: American Hoist and Derrick Co
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Filing: 1960-08-01
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Granted: 1964-01-14
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Expires: 1980-08-01
Abstract
No abstract record available.
Inventors
- 👤 Archer W Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 03:48
CPC Classifications
E; E02; E02F; E02F3/00; E02F3/04; E02F3/28; E02F3/36; E02F3/42; E02F3/427; E02F3/30; E02F3/32
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
175 words
IN A BACK HOE EXCAVATOR, THE COMBINATION WITH A SUPPORTING PLATFORM, A BOOM PIVOTALLY MOUNTED ON SAID PLATFORM FOR SWINGING MOVEMENT IN A VERTICAL PLANE AND EXTENDING OUTWARDLY FROM THE PLATFORM, A DIPPER WITH INWARDLY FACING CUTTING ELEMENT PIVOTALLY SUPPORTED ON AND BENEATH AN OUTER PORTION OF SAID BOOM FOR SWINGING MOVEMENT IN A VERTICAL PLANE AND INWARD AND OUTWARD MOVEMENT TOWARD AND AWAY FROM SAID PLATFORM, A MAST MOUNTED ON AND EXTENDING ABOVE THE PLATFORM, A DRAG LINE FOR REEVING IN SAID DIPPER AND A PULL-BACK LINE FOR ELEVATING AND LOWERING THE BOOM WITH DIPPER, OF HYDRAULICALLY ACTUATED MECHANISM ON SAID MAST AND ENGAGEABLE WITH AN INTERMEDIATE PORTION OF SAID BOOM FOR RESISTING UPWARD PIVOTAL MOVEMENT OF THE BOOM CAUSED BY DIGGING FORCES EXERTED ON THE CUTTING ELEMENT OF SAID DIPPER AND MEANS OPERABLE IN RESPONSE TO SLACKING OFF OF SAID PULL-BACK LINE FOR RENDERING SAID MECHANISM OPERATIVE TO RESIST UPWARD MOVEMENT OF SAID BOOM, SAID MEANS FURTHER BEING OPERABLE IN RESPONSE TO TENSION IN SAID PULL BACK LINE TO RENDER SAID MECHANISM INOPERABLE.
Claim 2
Dependent Claim
175 words
IN A BACK HOE EXCAVATOR, THE COMBINATION WITH A SUPPORTING PLATFORM, A BOOM PIVOTALLY MOUNTED ON SAID PLATFORM FOR SWINGING MOVEMENT IN A VERTICAL PLANE AND EXTENDING OUTWARDLY FROM THE PLATFORM, A DIPPER WITH INWARDLY FACING CUTTING ELEMENT PIVOTALLY SUPPORTED ON AND BENEATH AN OUTER PORTION OF SAID BOOM FOR SWINGING MOVEMENT IN A VERTICAL PLANE AND INWARD AND OUTWARD MOVEMENT TOWARD AND AWAY FROM SAID PLATFORM, A MAST MOUNTED ON AND EXTENDING ABOVE THE PLATFORM, A DRAG LINE FOR REEVING IN SAID DIPPER AND A PULL-BACK LINE FOR ELEVATING AND LOWERING THE BOOM WITH DIPPER, OF HYDRAULICALLY ACTUATED MECHANISM ON SAID MAST AND ENGAGEABLE WITH AN INTERMEDIATE PORTION OF SAID BOOM FOR RESISTING UPWARD PIVOTAL MOVEMENT OF THE BOOM CAUSED BY DIGGING FORCES EXERTED ON THE CUTTING ELEMENT OF SAID DIPPER AND MEANS OPERABLE IN RESPONSE TO SLACKING OFF OF SAID PULL-BACK LINE FOR RENDERING SAID MECHANISM OPERATIVE TO RESIST UPWARD MOVEMENT OF SAID BOOM, SAID MEANS FURTHER BEING OPERABLE IN RESPONSE TO TENSION IN SAID PULL BACK LINE TO RENDER SAID MECHANISM INOPERABLE.
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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) | 1967-01-13 | 1967-07-15 | 1968-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-01-13 | 1971-07-15 | 1972-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-01-13 | 1975-07-15 | 1976-01-14 | $7700.00 | Window Closed / Lapsed |