US3246471A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic drive control
Assignee: Ford Motor Co
•
Filing: 1964-12-10
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Granted: 1966-04-19
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Expires: 1984-12-10
Abstract
No abstract record available.
Inventors
- 👤 William B Goodale
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 00:29
CPC Classifications
F; F16; F16H; F16H61/00; F16H61/38; F16H61/40; F16H61/46; F16H61/47
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
189 words
A CONTROL CIRCUIT FOR A HYDRAULIC TRANSMISSION HAVING A FIRST VARIABLE DISPLACEMENT HYDRAULIC UNIT AND A SECOND FIXED DISPLACEMENT HYDRAULIC UNIT FLUID CONNECTED IN A CLOSED CIRCUIT BY A HIGH PRESSURE DISCHARGE LINE FROM SAID FIRST UNIT TO SAID SECOND UNIT AND A SUPERCHARGE PRESSURE RETURN LINE FOR THE DRIVE OF ONE OF SAID UNITS BY THE OTHER, CONTROL MEANS TO VARY THE DISPLACEMENT OF SAID FIRST UNIT FROM A MINIMUM TO A MAXIMUM, MEANS BIASING SAID LATTER MEANS TO A MINIMUM DISPLACEMENT POSITION, AND CONTROL MEANS OPERABLY CONNECTED TO SAID FIRST UNIT CONTROL MEANS FOR AUTOMATICALLY VARYING THE DISPLACEMENT OF SAID FIRST UNIT TO PROVIDE A CONSTANT SPEED OF SAID SECOND UNIT, SAID LATTER CONTROL MEANS INCLUDING A FLOW RESTRICTING MEANS IN THE FLUID DISCHARGE LINE FROM SAID FIRST UNIT TO THE INLET TO SAID SECOND UNIT, CONDUIT MEANS CONNECTING THE FLUID AT THE PRESSURE IN ONE OF SAID LINES TO OPPOSITE PORTIONS OF SAID FIRST UNIT CONTROL MEANS FOR RECIPROCATING SAID CONTROL MEANS IN OPPOSITE DIRECTIONS TO VARY THE DISPLACEMENT OF SAID FIRST UNIT, AND MEANS IN THE SAID CONDUIT MEANS TO ONE OF SAID PORTIONS MOVABLE
Claim 2
Dependent Claim
189 words
A CONTROL CIRCUIT FOR A HYDRAULIC TRANSMISSION HAVING A FIRST VARIABLE DISPLACEMENT HYDRAULIC UNIT AND A SECOND FIXED DISPLACEMENT HYDRAULIC UNIT FLUID CONNECTED IN A CLOSED CIRCUIT BY A HIGH PRESSURE DISCHARGE LINE FROM SAID FIRST UNIT TO SAID SECOND UNIT AND A SUPERCHARGE PRESSURE RETURN LINE FOR THE DRIVE OF ONE OF SAID UNITS BY THE OTHER, CONTROL MEANS TO VARY THE DISPLACEMENT OF SAID FIRST UNIT FROM A MINIMUM TO A MAXIMUM, MEANS BIASING SAID LATTER MEANS TO A MINIMUM DISPLACEMENT POSITION, AND CONTROL MEANS OPERABLY CONNECTED TO SAID FIRST UNIT CONTROL MEANS FOR AUTOMATICALLY VARYING THE DISPLACEMENT OF SAID FIRST UNIT TO PROVIDE A CONSTANT SPEED OF SAID SECOND UNIT, SAID LATTER CONTROL MEANS INCLUDING A FLOW RESTRICTING MEANS IN THE FLUID DISCHARGE LINE FROM SAID FIRST UNIT TO THE INLET TO SAID SECOND UNIT, CONDUIT MEANS CONNECTING THE FLUID AT THE PRESSURE IN ONE OF SAID LINES TO OPPOSITE PORTIONS OF SAID FIRST UNIT CONTROL MEANS FOR RECIPROCATING SAID CONTROL MEANS IN OPPOSITE DIRECTIONS TO VARY THE DISPLACEMENT OF SAID FIRST UNIT, AND MEANS IN THE SAID CONDUIT MEANS TO ONE OF SAID PORTIONS MOVABLE
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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) | 1969-04-18 | 1969-10-18 | 1970-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-18 | 1973-10-18 | 1974-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-18 | 1977-10-18 | 1978-04-19 | $7700.00 | Window Closed / Lapsed |