US3072272A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Trenching machines
Assignee: Leeford London Ltd
•
Filing: 1959-05-19
•
Granted: 1963-01-08
•
Expires: 1979-05-19
Abstract
No abstract record available.
Inventors
- 👤 Claude W Howlett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:52
CPC Classifications
E; E02; E02F; E02F9/00; E02F9/08; E02F9/085; E02F3/00; E02F3/04; E02F3/28; E02F3/283; E02F3/286
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
148 words
A TRENCHING EQUIPMENT WHICH COMPRISES A FIRST BOOM, MEANS ON THE FIRST BOOM FOR ATTACHING THE SAME TO A CONVENTIONAL PART OF A TRACTOR SO THAT THE FIRST BOOM IS HORIZONTAL AND EXTENDS ACROSS THE TRACTOR, A SECOND BOOM EXTENDING LONGITUDINALLY OF THE TRACTOR, MEANS INCLUDING A HORIZONTAL PIVOT FOR MOUNTING THE SECOND BOOM ON THE FIRST BOOM, A BUCKET, BUCKET CARRIER MEANS FOR MOUNTING THE BUCKET ON THE SECOND BOOM, MEANS FOR MOVING SAID CARRIER MEANS AND SAID BUCKET AXIALLY OF THE SECOND BOOM, EXTENSIBLE MEANS FOR MOVING THE SECOND BOOM ABOUT SAID PIVOT, MEANS FOR ATTACHING ONE END OF SAID EXTENSIBLE MEANS PIVOTALLY TO SAID FIRST BOOM, AND LOST MOTION MEANS FOR CONNECTING THE OTHER END OF SAID EXTENSIBLE MEANS TO THE SECOND BOOM WHEREBY THE SECOND BOOM CAN SWING ABOUT SAID PIVOT DURING DIGGING TO PERMIT THE BUCKET TO TRAVEL IN A STRAIGHT HORIZONTAL LINE.
Claim 2
Dependent Claim
148 words
A TRENCHING EQUIPMENT WHICH COMPRISES A FIRST BOOM, MEANS ON THE FIRST BOOM FOR ATTACHING THE SAME TO A CONVENTIONAL PART OF A TRACTOR SO THAT THE FIRST BOOM IS HORIZONTAL AND EXTENDS ACROSS THE TRACTOR, A SECOND BOOM EXTENDING LONGITUDINALLY OF THE TRACTOR, MEANS INCLUDING A HORIZONTAL PIVOT FOR MOUNTING THE SECOND BOOM ON THE FIRST BOOM, A BUCKET, BUCKET CARRIER MEANS FOR MOUNTING THE BUCKET ON THE SECOND BOOM, MEANS FOR MOVING SAID CARRIER MEANS AND SAID BUCKET AXIALLY OF THE SECOND BOOM, EXTENSIBLE MEANS FOR MOVING THE SECOND BOOM ABOUT SAID PIVOT, MEANS FOR ATTACHING ONE END OF SAID EXTENSIBLE MEANS PIVOTALLY TO SAID FIRST BOOM, AND LOST MOTION MEANS FOR CONNECTING THE OTHER END OF SAID EXTENSIBLE MEANS TO THE SECOND BOOM WHEREBY THE SECOND BOOM CAN SWING ABOUT SAID PIVOT DURING DIGGING TO PERMIT THE BUCKET TO TRAVEL IN A STRAIGHT HORIZONTAL LINE.
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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) | 1966-01-07 | 1966-07-09 | 1967-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-01-07 | 1970-07-09 | 1971-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-01-07 | 1974-07-09 | 1975-01-08 | $7700.00 | Window Closed / Lapsed |