Patent US3149469A successfully refreshed from Google Patents.
US3149469A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Controlled volume pump
Assignee: Milton Roy LLC
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Filing: 1962-04-27
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Granted: 1964-09-22
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Expires: 1982-04-27
Abstract
No abstract record available.
Inventors
- 👤 William A Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:42
CPC Classifications
F; F04; F04B; F04B43/00; F04B43/02; F04B43/06; F04B43/067; F04B43/073
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
227 words
A DEVICE FOR HYDRAULICALLY MOVING A MOVABLE ELEMENT FROM AND TO A PREDETERMINED LIMIT POSITION AGAINST STOP MEANS, SAID DEVICE COMPRISING: (A) A BODY DEFINING A CYLINDER COMMUNICATING WITH A PRESSURE CHAMBER DEFINED IN PART BY SAID MOVABLE ELEMENT, (B) A PLUNGER DISPOSED IN SAID CYLINDER FOR RECIPROCATING MOVEMENT THROUGH PRESSURE AND RETURN STROKES, (C) AN HYDRAULIC FLUID RESERVOIR, (D) MEANS DEFINING AN HYDRAULIC FLUID PASSAGE BETWEEN SAID RESERVOIR AND SAID PRESSURE CHAMBER AND INCLUDING A PORTED MEMBER MOVABLY MOUNTED IN SAID BODY, (E) VALVE MEANS COOPERABLE WITH SAID PORTED MEMBER FOR CONTROLLING FLOW OF HYDRAULIC FLUID IN SAID PASSAGE, (F) SAID VALVE MEANS HAVING A CLOSED POSITION CONFINING HYDRAULIC FLUID BETWEEN SAID PLUNGER AND SAID MOVABLE ELEMENT SO THAT THE LATTER FOLLOWS PRESSURE AND RETURN MOVEMENTS OF SAID PLUNGER, AND SAID VALVE MEANS HAVING AN OPEN POSITION IN WHICH HYDRAULIC FLUID FLOWS FREELY BETWEEN SAID RESERVOIR AND SAID PRESSURE CHAMBER, (G) DRIVE MEANS FOR OPERATING SAID PLUNGER AND SAID VALVE MEANS IN TIMED RELATION SO THAT THE EFFECTIVE LENGTH OF SAID RETURN STROKES EXCEEDS THE EFFECTIVE LENGTH OF SAID PRESSURE STROKES, WHEREBY SAID MOVABLE ELEMENT IS RETURNED TO ITS LIMIT POSITION UPON EACH RETURN STROKE, AND (H) CONTROL MEANS FOR ADJUSTABLY POSITIONING SAID PORTED MEMBER TO VARY THE EFFECTIVE LENGTHS OF SAID PRESSURE AND RETURN STROKES AND HENCE TO VARY THE MOVEMENT OF SAID MOVABLE ELEMENT.
Claim 2
Independent Claim
227 words
A DEVICE FOR HYDRAULICALLY MOVING A MOVABLE ELEMENT FROM AND TO A PREDETERMINED LIMIT POSITION AGAINST STOP MEANS, SAID DEVICE COMPRISING: (A) A BODY DEFINING A CYLINDER COMMUNICATING WITH A PRESSURE CHAMBER DEFINED IN PART BY SAID MOVABLE ELEMENT, (B) A PLUNGER DISPOSED IN SAID CYLINDER FOR RECIPROCATING MOVEMENT THROUGH PRESSURE AND RETURN STROKES, (C) AN HYDRAULIC FLUID RESERVOIR, (D) MEANS DEFINING AN HYDRAULIC FLUID PASSAGE BETWEEN SAID RESERVOIR AND SAID PRESSURE CHAMBER AND INCLUDING A PORTED MEMBER MOVABLY MOUNTED IN SAID BODY, (E) VALVE MEANS COOPERABLE WITH SAID PORTED MEMBER FOR CONTROLLING FLOW OF HYDRAULIC FLUID IN SAID PASSAGE, (F) SAID VALVE MEANS HAVING A CLOSED POSITION CONFINING HYDRAULIC FLUID BETWEEN SAID PLUNGER AND SAID MOVABLE ELEMENT SO THAT THE LATTER FOLLOWS PRESSURE AND RETURN MOVEMENTS OF SAID PLUNGER, AND SAID VALVE MEANS HAVING AN OPEN POSITION IN WHICH HYDRAULIC FLUID FLOWS FREELY BETWEEN SAID RESERVOIR AND SAID PRESSURE CHAMBER, (G) DRIVE MEANS FOR OPERATING SAID PLUNGER AND SAID VALVE MEANS IN TIMED RELATION SO THAT THE EFFECTIVE LENGTH OF SAID RETURN STROKES EXCEEDS THE EFFECTIVE LENGTH OF SAID PRESSURE STROKES, WHEREBY SAID MOVABLE ELEMENT IS RETURNED TO ITS LIMIT POSITION UPON EACH RETURN STROKE, AND (H) CONTROL MEANS FOR ADJUSTABLY POSITIONING SAID PORTED MEMBER TO VARY THE EFFECTIVE LENGTHS OF SAID PRESSURE AND RETURN STROKES AND HENCE TO VARY THE MOVEMENT OF SAID MOVABLE ELEMENT.
References Cited (Backward Citations)
GB633708A
Cited
US2975599A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-09-22 | 1968-03-23 | 1968-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-22 | 1972-03-23 | 1972-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-22 | 1976-03-23 | 1976-09-22 | $7700.00 | Window Closed / Lapsed |