US3272135A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power transmission
Assignee: Unisys Corp
•
Filing: 1963-04-05
•
Granted: 1966-09-13
•
Expires: 1983-04-05
Abstract
No abstract record available.
Inventors
- 👤 James V Bloomquist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:30
CPC Classifications
F; F16; F16H; F16H61/00; F16H61/38; F16H61/40; F16H61/46; F16H61/472
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
164 words
IN A HYDRAULIC POWER TRANSMISSION EMPLOYING A VARIABLE DISPLACEMENT PUMP HAVING AN OUTLET CONNECTED BY A PRESSURE CONDUIT TO A LOAD, AND ACTUATOR MEANS FOR VARYING THE DISPLACEMENT OF SAID PUMP, CONTROL MEANS FOR SAID ACTUATOR COMPRISING: SHIFTABLE VALVE MEANS FOR DIRECTING FLUID TO SAID ACTUATOR; RESILIENT MEANS BIASING SAID VALVE MEANS IN ONE DIRECTION; MEANS FORMING A FIRST AREA ASSOCIATED WITH SAID VALVE MEANS AND EXPOSED TO PRESSURE FROM THE OUTLET OF SAID PUMP SO AS TO URGE SAID VALVE IN A DIRECTION OPPOSITE TO SAID ONE DIRECTION; MEANS FORMING A SECOND AREA, SMALLER THAN SAID FIRST AREA, ASSOCIATED WITH SAID VALVE MEANS SO AS TO URGE SAID VALVE IN SAID ONE DIRECTION IN RESPONSE TO PRESSURE THEREON; MEANS FORMING AN ENCLOSED CHAMBER, PRESSURE IN WHICH IS IMPOSED ON SAID SECOND AREA; CONTINUOUSLY OPEN PASSAGE MEANS EXTENDING BEWEEN SAID FIRST AREA AND SAID CHAMBER AND FORMING THE SOLE MEANS OF EGRESS FOR FLUID FROM SAID CHAMBER; AND A RESTRICTION IN SAID PASSAGE MEANS.
Claim 2
Dependent Claim
164 words
IN A HYDRAULIC POWER TRANSMISSION EMPLOYING A VARIABLE DISPLACEMENT PUMP HAVING AN OUTLET CONNECTED BY A PRESSURE CONDUIT TO A LOAD, AND ACTUATOR MEANS FOR VARYING THE DISPLACEMENT OF SAID PUMP, CONTROL MEANS FOR SAID ACTUATOR COMPRISING: SHIFTABLE VALVE MEANS FOR DIRECTING FLUID TO SAID ACTUATOR; RESILIENT MEANS BIASING SAID VALVE MEANS IN ONE DIRECTION; MEANS FORMING A FIRST AREA ASSOCIATED WITH SAID VALVE MEANS AND EXPOSED TO PRESSURE FROM THE OUTLET OF SAID PUMP SO AS TO URGE SAID VALVE IN A DIRECTION OPPOSITE TO SAID ONE DIRECTION; MEANS FORMING A SECOND AREA, SMALLER THAN SAID FIRST AREA, ASSOCIATED WITH SAID VALVE MEANS SO AS TO URGE SAID VALVE IN SAID ONE DIRECTION IN RESPONSE TO PRESSURE THEREON; MEANS FORMING AN ENCLOSED CHAMBER, PRESSURE IN WHICH IS IMPOSED ON SAID SECOND AREA; CONTINUOUSLY OPEN PASSAGE MEANS EXTENDING BEWEEN SAID FIRST AREA AND SAID CHAMBER AND FORMING THE SOLE MEANS OF EGRESS FOR FLUID FROM SAID CHAMBER; AND A RESTRICTION IN SAID PASSAGE MEANS.
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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) | 1969-09-12 | 1970-03-14 | 1970-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-12 | 1974-03-14 | 1974-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-12 | 1978-03-14 | 1978-09-13 | $7700.00 | Window Closed / Lapsed |