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US3220581A Expired / Lapsed US ⏱️ 0.0 years remaining

Material handling equipment

Assignee: Case LLC
•
Filing: 1964-12-14
•
Granted: 1965-11-30
•
Expires: 1984-12-14
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Abstract

No abstract record available.

Inventors

  • 👤 Carl O Pedersen
  • 👤 Herman J Maurer

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-01 12:08
CPC Classifications
E; E02; E02F; E02F3/00; E02F3/04; E02F3/28; E02F3/36; E02F3/42; E02F3/43; E02F3/431; E02F3/434; E02F3/432; E02F3/433

Claims Analysis

Total Claims: 2
Claim 1
Independent Claim 222 words
A FRONT END LOADER FOR A TRACTOR INCLUDING A FRAME ADAPTED TO BE SECURED TO SAID TRACTOR, A PAIR OF TRANSVERSELY SPACED LIFT ARMS PIVOTALLY MOUNTED ON ONE END THEREOF TO SAID FRAME, A BUCKET PIVOTALLY CONNECTED TO THE OPPOSITE ENDS OF SAID LIFT AMRS, HYDRAULIC MEANS DISPOSED BETWEEN THE FRAME AND ONE OF SAID LIFT AMRS FOR RAISING AND LOWERING SAID LIFT ARMS, A BUCKET POSITIONING MEANS DISPOSED BETWEEN AT LEAST ONE OF SAID LIFT ARMS AND BUCKET AND INCLUDING A HYDRAULIC CYLINDER FOR MOVINT THE BUCKET BETWEEN THE DIGGING AND DUMPING POSITIONS, A SLAVE CYLINDER ASSEMBLY INTERCONNECTED BETWEEN SAID FRAME AND ONE OF SAID LIFT ARMS, MEANS FOR SUPPLYING FLUID FROM ONE SIDE OF AID SALVE CYLINDER TO ONE SIDE OF SAID BUCKET POSITIONING CYLINDER WHEN THE LIFT ARMS ARE LOWERED, CONDUIT MEANS FOR BYPASSING FLUID FROM THE OTHER SIDE OF SAID BUCKET POSITIONING CYLINDER TO SAID ONE SIDE THEREOF WHEN FLUID IS SUPPLIED TO SAID ONE SIDE OF THE BUCKET POSITIONING CYLINDER, VALVE MEANS FOR CONTROLLING THE FLOW THROUGH SAID LAST-MENTIONED CONDUIT MEANS, SAID SLAVE CYLINDER AND BUCKET POSITIONING CYLINDER BEING DESIGNED TO DIRECT A PREDETERMINED AMOUNT OF FLUID TO SAID ONE SIDE OF SAID BUCKET POSITIONING CYLINDER TO MOVE THE BUCKET FROM THE DUMPING TO THE DIGGING POSITIONS WHEN THE LIFT ARMS HAVE BEEN RETURNED TO GROULD LEVEL.
Claim 2
Dependent Claim 222 words
A FRONT END LOADER FOR A TRACTOR INCLUDING A FRAME ADAPTED TO BE SECURED TO SAID TRACTOR, A PAIR OF TRANSVERSELY SPACED LIFT ARMS PIVOTALLY MOUNTED ON ONE END THEREOF TO SAID FRAME, A BUCKET PIVOTALLY CONNECTED TO THE OPPOSITE ENDS OF SAID LIFT AMRS, HYDRAULIC MEANS DISPOSED BETWEEN THE FRAME AND ONE OF SAID LIFT AMRS FOR RAISING AND LOWERING SAID LIFT ARMS, A BUCKET POSITIONING MEANS DISPOSED BETWEEN AT LEAST ONE OF SAID LIFT ARMS AND BUCKET AND INCLUDING A HYDRAULIC CYLINDER FOR MOVINT THE BUCKET BETWEEN THE DIGGING AND DUMPING POSITIONS, A SLAVE CYLINDER ASSEMBLY INTERCONNECTED BETWEEN SAID FRAME AND ONE OF SAID LIFT ARMS, MEANS FOR SUPPLYING FLUID FROM ONE SIDE OF AID SALVE CYLINDER TO ONE SIDE OF SAID BUCKET POSITIONING CYLINDER WHEN THE LIFT ARMS ARE LOWERED, CONDUIT MEANS FOR BYPASSING FLUID FROM THE OTHER SIDE OF SAID BUCKET POSITIONING CYLINDER TO SAID ONE SIDE THEREOF WHEN FLUID IS SUPPLIED TO SAID ONE SIDE OF THE BUCKET POSITIONING CYLINDER, VALVE MEANS FOR CONTROLLING THE FLOW THROUGH SAID LAST-MENTIONED CONDUIT MEANS, SAID SLAVE CYLINDER AND BUCKET POSITIONING CYLINDER BEING DESIGNED TO DIRECT A PREDETERMINED AMOUNT OF FLUID TO SAID ONE SIDE OF SAID BUCKET POSITIONING CYLINDER TO MOVE THE BUCKET FROM THE DUMPING TO THE DIGGING POSITIONS WHEN THE LIFT ARMS HAVE BEEN RETURNED TO GROULD LEVEL.

References Cited (Backward Citations)

US2872946A Cited
US2853200A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1968-11-29 1969-05-31 1969-11-30 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1972-11-29 1973-05-31 1973-11-30 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1976-11-29 1977-05-31 1977-11-30 $7700.00 Window Closed / Lapsed

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