US3266434A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable output pump
Assignee: Webster Electric Co Inc
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Filing: 1964-04-10
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Granted: 1966-08-16
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Expires: 1984-04-10
Abstract
No abstract record available.
Inventors
- 👤 John C Mcalvay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:32
CPC Classifications
F; F04; F04B; F04B1/00; F04B1/12; F04B1/26; F04B1/30; F04B1/32; F04B1/324; F04B49/00; F04B49/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
168 words
A VARIABLE OUTPUT PUMP, INCLUDING IN COMBINATION, AN ASSEMBLY OF ANNULARLY DISPOSED PISTONS, THE ASSEMBLY BEING ROTATABLE ABOUT A FIRST AXIS, A SWASH PLATE ENGAGED BY THE PISTONS AND TILTABLE ABOUT A SECOND AXIS NORMAL TO THE FIRST AXIS BETWEEN MINIMUM AND MAXIMUM OUTPUT POSITIONS TO VARY THE OUTPUT OF THE PUMP. SAID PISTONS PRODUCING FORCES TENDING TO RETURN THE SWASH PLATE TO ITS MINIMUM OUTPUT POSITION, MEANS INCLUDING A CYLINDER, A PISTON IN SAID CYLINDER RESPONSIVE TO PUMP OUTPUT PRESSURE AND OPERABLY INTERCONNECTED WITH SAID SWASH PLATE, SAID PISTON BEING HYDRAULICALLY UNBLANCED SUFFICIENTLY TO OVERCOME SAID FORCES BY RESTRICTED COMUNICATION FROM A FIRST SIDE OF THE PISTON CONNECTED TO THE PUMP OUTPUT PRESSURE TO A SECOND AND LARGER AREA SIDE OF THE PISTON, AND A RELIEF VALVE OPERABLE ABOVE A PREDETERMINED PRESSURE COMMUNICATING WITH AND SOLELY RESPONSIVE TO PRESSURE AT THE SECOND SIDE OF THE PISTON FOR MAINTAINING THE SWASH PLATE IN MAXIMUM OUTPUT POSITION UNTIL THE PREDETERMINED PUMP OUTPUT PRESSURE IS REACHED AND FOR THE THERE-
Claim 2
Dependent Claim
168 words
A VARIABLE OUTPUT PUMP, INCLUDING IN COMBINATION, AN ASSEMBLY OF ANNULARLY DISPOSED PISTONS, THE ASSEMBLY BEING ROTATABLE ABOUT A FIRST AXIS, A SWASH PLATE ENGAGED BY THE PISTONS AND TILTABLE ABOUT A SECOND AXIS NORMAL TO THE FIRST AXIS BETWEEN MINIMUM AND MAXIMUM OUTPUT POSITIONS TO VARY THE OUTPUT OF THE PUMP. SAID PISTONS PRODUCING FORCES TENDING TO RETURN THE SWASH PLATE TO ITS MINIMUM OUTPUT POSITION, MEANS INCLUDING A CYLINDER, A PISTON IN SAID CYLINDER RESPONSIVE TO PUMP OUTPUT PRESSURE AND OPERABLY INTERCONNECTED WITH SAID SWASH PLATE, SAID PISTON BEING HYDRAULICALLY UNBLANCED SUFFICIENTLY TO OVERCOME SAID FORCES BY RESTRICTED COMUNICATION FROM A FIRST SIDE OF THE PISTON CONNECTED TO THE PUMP OUTPUT PRESSURE TO A SECOND AND LARGER AREA SIDE OF THE PISTON, AND A RELIEF VALVE OPERABLE ABOVE A PREDETERMINED PRESSURE COMMUNICATING WITH AND SOLELY RESPONSIVE TO PRESSURE AT THE SECOND SIDE OF THE PISTON FOR MAINTAINING THE SWASH PLATE IN MAXIMUM OUTPUT POSITION UNTIL THE PREDETERMINED PUMP OUTPUT PRESSURE IS REACHED AND FOR THE THERE-
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) | 1969-08-15 | 1970-02-14 | 1970-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-15 | 1974-02-14 | 1974-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-15 | 1978-02-14 | 1978-08-16 | $7700.00 | Window Closed / Lapsed |