US3089427A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic machines
Assignee: Council of Scientific and Industrial Research
•
Filing: 1960-04-14
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Granted: 1963-05-14
•
Expires: 1980-04-14
Abstract
No abstract record available.
Inventors
- 👤 Firth Donald
- 👤 Roger H Y Hancock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:14
CPC Classifications
F; F01; F01B; F01B3/00; F01B3/0032; F01B3/0044; F01B3/0055; F01B3/10; F01B3/103; F01B3/104
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
168 words
A SWASH PLATE TYPE HYDRAULIC MACHINE COMPRISING A STATIONARY SWASH PLATE, A ROTATABLE CYLINDER BLOCK, A PLURALITY OF PISTONS RECIPROCABLE IN CYLINDERS IN SAID CYLINDER BLOCK UNDER CONTROL OF THE SWASH PLATE, PORTS IN A FLAT FACE OF THE CYLINDER BLOCK COMMUNICATING WITH THE CYLINDERS THEREIN, A STATIONARY PORT BLOCK HAVING A FLAT FACE, INLET AND OUTLET PORTS IN SAID FLAT FACE OF THE PORT BLOCK REGISTRABLE WITH THE PORTS IN THE CYLINDER BLOCK, A PORT PLATE INTERPOSED BETWEEN THE FLAT FACES OF THE CYLINDER BLOCK AND THE PORT BLOCK AND HAVING APERTURES PERMITTING THE PASSAGE OF FLUID BETWEEN THE PORTS IN THE CYLINDER BLOCK AND THE PORTS IN THE PORT BLOCK, SAID PORT PLATE HAVING OPPOSITE FLAT FACES OF SUNSTANTIALLY EQUAL AREA AND CLEARANCES BEING PROVIDED BETWEEN SAID OPPOSITE FACES AND THE FLAT FACES OF THE CYLINDER BLOCK AND THE PORT BLOCK WITHIN THE LIMITS OF WHICH CLEARANCES THE PORT PLATE IS FREE TO MOVE AXIALLY, WHEREBY PRESSURE FLUID FROM SAID PORTS MAINTAINS A FLUID FILM ON
Claim 2
Dependent Claim
168 words
A SWASH PLATE TYPE HYDRAULIC MACHINE COMPRISING A STATIONARY SWASH PLATE, A ROTATABLE CYLINDER BLOCK, A PLURALITY OF PISTONS RECIPROCABLE IN CYLINDERS IN SAID CYLINDER BLOCK UNDER CONTROL OF THE SWASH PLATE, PORTS IN A FLAT FACE OF THE CYLINDER BLOCK COMMUNICATING WITH THE CYLINDERS THEREIN, A STATIONARY PORT BLOCK HAVING A FLAT FACE, INLET AND OUTLET PORTS IN SAID FLAT FACE OF THE PORT BLOCK REGISTRABLE WITH THE PORTS IN THE CYLINDER BLOCK, A PORT PLATE INTERPOSED BETWEEN THE FLAT FACES OF THE CYLINDER BLOCK AND THE PORT BLOCK AND HAVING APERTURES PERMITTING THE PASSAGE OF FLUID BETWEEN THE PORTS IN THE CYLINDER BLOCK AND THE PORTS IN THE PORT BLOCK, SAID PORT PLATE HAVING OPPOSITE FLAT FACES OF SUNSTANTIALLY EQUAL AREA AND CLEARANCES BEING PROVIDED BETWEEN SAID OPPOSITE FACES AND THE FLAT FACES OF THE CYLINDER BLOCK AND THE PORT BLOCK WITHIN THE LIMITS OF WHICH CLEARANCES THE PORT PLATE IS FREE TO MOVE AXIALLY, WHEREBY PRESSURE FLUID FROM SAID PORTS MAINTAINS A FLUID FILM ON
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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) | 1966-05-13 | 1966-11-12 | 1967-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-05-13 | 1970-11-12 | 1971-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-05-13 | 1974-11-12 | 1975-05-14 | $7700.00 | Window Closed / Lapsed |