Patent US3309870A successfully refreshed from Google Patents.
US3309870A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrostatic transmission
Assignee: Sundstrand Corp
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Filing: 1965-07-06
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Granted: 1967-03-21
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Expires: 1985-07-06
Abstract
No abstract record available.
Inventors
- 👤 John W Pinkerton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:00
CPC Classifications
F; F16; F16H; F16H39/00; F16H39/04; F16H39/06; F16H39/08; F16H39/10; F16H39/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
128 words
A HYDROSTATIC TRANSMISSION ASSEMBLY, COMPRISING: A HYDRAULIC TRANSMISSION CARTRIDGE INCLUDING A FIRST AXIAL PISTON HYDRAULIC UNIT ADAPTED TO RECEIVE AND DELIVER FLUID, A SECOND AXIAL PISTON HYDRAULIC UNIT ADAPTED TO RECEIVE AND DELIVER FLUID, EACH OF SAID HYDRAULIC UNITS INCLUDING A ROTATABLE CYLINDER BLOCK, CAM MEANS FOR RECIPROCATING PISTONS THEREIN AND A HOUSING SURROUNDING THE BLOCK AND CAM MEANS, AND A VALVE PLATE HAVING PORTS THEREIN COMMUNICATING WITH SAID FIRST AND SECOND HYDRAULIC UNITS, SAID CYLINDER BLOCKS BOTH SLIDABLY ENGAGING SAID VALVE PLATE, SAID FIRST AND SECOND HYDRAULIC UNITS BEING IN BACKTO-BACK RELATION, HAVING A COMMON AXIS OF ROTATION AND BEING FIXED TOGETHER WITH SAID VALVE PLATE AS A UNIT; A BASE MEMBER SURROUNDING AND SUPPORTING SAID CARTRIDGE, SAID BASE MEMBER BEING CONSTRUCTED TO PERMIT THE INSERTION OF
Claim 2
Dependent Claim
128 words
A HYDROSTATIC TRANSMISSION ASSEMBLY, COMPRISING: A HYDRAULIC TRANSMISSION CARTRIDGE INCLUDING A FIRST AXIAL PISTON HYDRAULIC UNIT ADAPTED TO RECEIVE AND DELIVER FLUID, A SECOND AXIAL PISTON HYDRAULIC UNIT ADAPTED TO RECEIVE AND DELIVER FLUID, EACH OF SAID HYDRAULIC UNITS INCLUDING A ROTATABLE CYLINDER BLOCK, CAM MEANS FOR RECIPROCATING PISTONS THEREIN AND A HOUSING SURROUNDING THE BLOCK AND CAM MEANS, AND A VALVE PLATE HAVING PORTS THEREIN COMMUNICATING WITH SAID FIRST AND SECOND HYDRAULIC UNITS, SAID CYLINDER BLOCKS BOTH SLIDABLY ENGAGING SAID VALVE PLATE, SAID FIRST AND SECOND HYDRAULIC UNITS BEING IN BACKTO-BACK RELATION, HAVING A COMMON AXIS OF ROTATION AND BEING FIXED TOGETHER WITH SAID VALVE PLATE AS A UNIT; A BASE MEMBER SURROUNDING AND SUPPORTING SAID CARTRIDGE, SAID BASE MEMBER BEING CONSTRUCTED TO PERMIT THE INSERTION OF
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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) | 1970-03-20 | 1970-09-19 | 1971-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-20 | 1974-09-19 | 1975-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-20 | 1978-09-19 | 1979-03-21 | $7700.00 | Window Closed / Lapsed |