Patent US3138884A successfully refreshed from Google Patents.
US3138884A
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Hydraulic circuit for actuation of an earthmoving scraper ejector
Assignee: Caterpillar Inc
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Filing: 1962-03-15
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Granted: 1964-06-30
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Expires: 1982-03-15
Abstract
No abstract record available.
Inventors
- 👤 Allyn J Hein
- 👤 John A Junck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:01
CPC Classifications
E; E02; E02F; E02F3/00; E02F3/04; E02F3/64; E02F3/65; E02F3/654; E02F3/656; E02F3/6454; E02F3/6481; E02F3/651; F; F15; F15B; F15B11/00; F15B11/02; F15B11/024; F15B13/00; F15B13/02; F15B13/021; F15B2211/00; F15B2211/30; F15B2211/305; F15B2211/30525; F15B2211/3056; F15B2211/30565; F15B2211/3058; F15B2211/31; F15B2211/3105; F15B2211/3116; F15B2211/315; F15B2211/3157; F15B2211/31576; F15B2211/31588; F15B2211/32; F15B2211/321; F15B2211/324; F15B2211/70; F15B2211/75; F15B2211/775
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
133 words
IN COMBINATION WITH AN EARTHMOVING SCRAPER HAVING A BOWL AND AN EJECTOR MOVEABLE THROUGH THE BOWL FOR EJECTING ITS CONTENTS, A CIRCUIT FOR HYDRAULIC FLUID UNDER PRESSURE, AND A JACK IN SAID CIRCUIT FOR MOVING THE EJECTOR, MEANS TO DIRECT FLUID TO ONE END OF THE JACK, A FIRST MEANS TO RETURN FLUID FROM THE OPPOSITE END OF THE JACK TO A SOURCE, A SECOND MEANS TO DIRECT FLUID FROM SAID OPPOSITE END TO SAID FIRST END TO SPEED THE OPERATION OF THE JACK, A VALVE TO DIRECT FLUID SELECTIVELY THROUGH SAID FIRST AND SECOND MEANS, AND MEANS RESPONSIVE TO PRESSURE OF FLUID DIRECTED TO SAID ONE END OF THE JACK TO ACTUATE SAID VALVE TO DIRECT FLUID FROM SAID OPPOSITE END OF THE JACK SELECTIVELY TO THE FIRST END OR THE SOURCE.
Claim 2
Dependent Claim
133 words
IN COMBINATION WITH AN EARTHMOVING SCRAPER HAVING A BOWL AND AN EJECTOR MOVEABLE THROUGH THE BOWL FOR EJECTING ITS CONTENTS, A CIRCUIT FOR HYDRAULIC FLUID UNDER PRESSURE, AND A JACK IN SAID CIRCUIT FOR MOVING THE EJECTOR, MEANS TO DIRECT FLUID TO ONE END OF THE JACK, A FIRST MEANS TO RETURN FLUID FROM THE OPPOSITE END OF THE JACK TO A SOURCE, A SECOND MEANS TO DIRECT FLUID FROM SAID OPPOSITE END TO SAID FIRST END TO SPEED THE OPERATION OF THE JACK, A VALVE TO DIRECT FLUID SELECTIVELY THROUGH SAID FIRST AND SECOND MEANS, AND MEANS RESPONSIVE TO PRESSURE OF FLUID DIRECTED TO SAID ONE END OF THE JACK TO ACTUATE SAID VALVE TO DIRECT FLUID FROM SAID OPPOSITE END OF THE JACK SELECTIVELY TO THE FIRST END OR THE SOURCE.
References Cited (Backward Citations)
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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) | 1967-06-30 | 1967-12-30 | 1968-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-30 | 1971-12-30 | 1972-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-30 | 1975-12-30 | 1976-06-30 | $7700.00 | Window Closed / Lapsed |