US3343494A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatically reversible gear pump
Assignee: Sundstrand Corp
•
Filing: 1966-09-12
•
Granted: 1967-09-26
•
Expires: 1986-09-12
Abstract
No abstract record available.
Inventors
- 👤 Robert W Erikson
- 👤 Swedberg Nils Einar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:37
CPC Classifications
F; F04; F04C; F04C14/00; F04C14/04; F04C2/00; F04C2/08; F04C2/10; F04C2/101
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
165 words
IN A GEAR PUMP, THE COMBINATION COMPRISING: AN INPUT SHAFT ROTATABLE ABOUT AN AXIS, AN OUTER RING GEAR ADJACENT ONE END OF SAID INPUT SHAFT AND DRIVEN THEREBY, AN INDEXIBLE PORT PLATE SLIDABLY ENGAGING SAID OUTER RING GEAR AND HAVING TWO GENERALLY ARCUATE PORTS EXTENDING AXIALLY THERETHROUGH, SAID PORT PLATE HAVING AN ARCUATE RECESS IN THE PERIPHERY THEREOF EXTENDING SUBSTANTIALLY 180 DEGREES, A HOLLOW SHAFT MOUNTED IN SAID PORT AND EXTENDING WITHIN SAID RING GEAR, SAID HOLLOW SHAFT HAVING AN AXIS SPACED FROM SAID INPUT SHAFT AXIS, AN INNER PINION GEAR MOUNTED FOR ROTATION ON SAID HOLLOW SHAFT AND MESHING WITH SAID OUTER RING GEAR, A PASSAGE IN SAID INPUT SHAFT COMMUNICATING WITH THE INTERIOR OF SAID HOLLOW SHAFT ADAPTED TO CONVEY FLUID FROM THE PUMP, A RELATIVELY STATIONARY COVER MEMBER ENGAGING ONE SIDE OF SAID PORT PLATE, A PROJECTION ON SAID COVER MEMBER EXTENDING INTO SAID PORT PLATE RECESS FOR LIMITING THE INDEXING MOVEMENT THEREOF WHEREBY WHEN THE INPUT SHAFT ROTATES THE PORT PLATE,
Claim 2
Dependent Claim
165 words
IN A GEAR PUMP, THE COMBINATION COMPRISING: AN INPUT SHAFT ROTATABLE ABOUT AN AXIS, AN OUTER RING GEAR ADJACENT ONE END OF SAID INPUT SHAFT AND DRIVEN THEREBY, AN INDEXIBLE PORT PLATE SLIDABLY ENGAGING SAID OUTER RING GEAR AND HAVING TWO GENERALLY ARCUATE PORTS EXTENDING AXIALLY THERETHROUGH, SAID PORT PLATE HAVING AN ARCUATE RECESS IN THE PERIPHERY THEREOF EXTENDING SUBSTANTIALLY 180 DEGREES, A HOLLOW SHAFT MOUNTED IN SAID PORT AND EXTENDING WITHIN SAID RING GEAR, SAID HOLLOW SHAFT HAVING AN AXIS SPACED FROM SAID INPUT SHAFT AXIS, AN INNER PINION GEAR MOUNTED FOR ROTATION ON SAID HOLLOW SHAFT AND MESHING WITH SAID OUTER RING GEAR, A PASSAGE IN SAID INPUT SHAFT COMMUNICATING WITH THE INTERIOR OF SAID HOLLOW SHAFT ADAPTED TO CONVEY FLUID FROM THE PUMP, A RELATIVELY STATIONARY COVER MEMBER ENGAGING ONE SIDE OF SAID PORT PLATE, A PROJECTION ON SAID COVER MEMBER EXTENDING INTO SAID PORT PLATE RECESS FOR LIMITING THE INDEXING MOVEMENT THEREOF WHEREBY WHEN THE INPUT SHAFT ROTATES THE PORT PLATE,
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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) | 1970-09-25 | 1971-03-27 | 1971-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-09-25 | 1975-03-27 | 1975-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-09-25 | 1979-03-27 | 1979-09-26 | $7700.00 | Window Closed / Lapsed |