Patents by Inventor Roy Ernest Edwards

Roy Ernest Edwards 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).

  • Patent number: 4006593
    Abstract: In a dual hydraulic master cylinder assembly both pressure spaces are connected by a transfer passage incorporating a transfer valve which is open when both master cylinders are operated simultaneously, and the transfer valve comprises an unsprung valve member for engagement with one of a pair of spaced valve seatings to cut-off communication between the pressure spaces when one master cylinder is operated on its own.
    Type: Grant
    Filed: June 5, 1975
    Date of Patent: February 8, 1977
    Assignee: Girling Limited
    Inventor: Roy Ernest Edwards