US3221660A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic control for variable displacement pump
Assignee: HARTMANN CONTROLS Inc C/O ROCKFORD AUTOMATION Inc 3381 FOREST VIEW ROAD ROCKFORD IL 61109 A CORP OF WI
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Filing: 1963-08-20
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Granted: 1965-12-07
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Expires: 1983-08-20
Abstract
No abstract record available.
Inventors
- 👤 Amato Michael A D
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:03
CPC Classifications
F; F04; F04B; F04B1/00; F04B1/12; F04B1/20; F04B1/26; F04B1/30; F04B1/32; F04B1/324; F04B49/00; F04B49/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
121 words
IN A VARIABLE DISPLACEMENT PUMP, INCLUDING A CASING HAVING INLET AND DELIVERY PORTS AND A TILTABLE SWASH PLATE, THE IMPROVEMENT COMPRISING FIRST AND SECOND CYLINDERS IN SAID CASING, SAID CYLINDERS EACH HAVING OPEN AND CLOSED ENDS, FIRST AND SECOND PLUNGERS RESPECTIVELY SLIDING IN THE OPEN ENDS OF SAID CYLINDERS, SAID PLUNGERS HAVING OUTER ENDS RESPECTIVELY ENGAGING DIAMETRICALLY OPPOSITE SIDES OF SAID SWASH PLATE AND INNER ENDS FACING THE CLOSED ENDS OF THEIR RESPECTIVE CYLINDERS WHEREBY A FORCE APPLIED TP THE INNER END OF SAID FIRST PLUNGER TENDS TO SLIDE THE SAME OUTWARDLY AND THEREBY TILT THE SWASH PLATE TO DECREASE DELIVERY AND A FORCE APPLIED TO THE INNER END OF THE SECOND PLUNGER TENDS TO SLIDE THE SAME OUTWARDLY AND TILT
Claim 2
Dependent Claim
121 words
IN A VARIABLE DISPLACEMENT PUMP, INCLUDING A CASING HAVING INLET AND DELIVERY PORTS AND A TILTABLE SWASH PLATE, THE IMPROVEMENT COMPRISING FIRST AND SECOND CYLINDERS IN SAID CASING, SAID CYLINDERS EACH HAVING OPEN AND CLOSED ENDS, FIRST AND SECOND PLUNGERS RESPECTIVELY SLIDING IN THE OPEN ENDS OF SAID CYLINDERS, SAID PLUNGERS HAVING OUTER ENDS RESPECTIVELY ENGAGING DIAMETRICALLY OPPOSITE SIDES OF SAID SWASH PLATE AND INNER ENDS FACING THE CLOSED ENDS OF THEIR RESPECTIVE CYLINDERS WHEREBY A FORCE APPLIED TP THE INNER END OF SAID FIRST PLUNGER TENDS TO SLIDE THE SAME OUTWARDLY AND THEREBY TILT THE SWASH PLATE TO DECREASE DELIVERY AND A FORCE APPLIED TO THE INNER END OF THE SECOND PLUNGER TENDS TO SLIDE THE SAME OUTWARDLY AND TILT
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-12-06 | 1969-06-07 | 1969-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-06 | 1973-06-07 | 1973-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-06 | 1977-06-07 | 1977-12-07 | $7700.00 | Window Closed / Lapsed |