Low pressure signal driven flow control system
CA 1096271 A · Owner: Caterpillar Tractor Co. · Inventors: Johnson, Howard L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A hydraulic system including a bidirectional hydraulic motor having first and second fluid ports a pump, a control, valve for selectively connecting the pump to (a) the first port and venting the second port and (b) the second port and venting the first port, a modulating valve interposed between the pump and the control valve for varying flow from the pump to the control valve, a pilot for the modulating valve and a resolver, for selecting the lowest pressure at the motor ports and for directing a fluid signal proportional there-to to the pilot to control the modulating valve. - 1 -
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted February 24, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 24, 1998.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.