Patents by Inventor Phillip A. ROWLES

Phillip A. ROWLES has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20170037877
    Abstract: A spool for a hydraulic spool valve, comprising: a pressure chamber for connecting a pressure line to a hydraulic cylinder; at least one return chamber for connecting the hydraulic cylinder to a reservoir; and an actuator slot for receiving a drive lever; wherein the spool further comprises a fluid path connecting said pressure chamber to said actuator slot and a pressure plate movably mounted in the slot such that in use it is disposed between the fluid path and the drive lever.
    Type: Application
    Filed: August 5, 2016
    Publication date: February 9, 2017
    Inventors: Paul BREWER, Reg RAVAL, Phillip A. ROWLES