Patents by Inventor Ernest D. Schaefer

Ernest D. Schaefer 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: 3937020
    Abstract: A dual master cylinder has a cylinder housing in which one bore is provided. A pair of pressurizing pistons are mounted in tandem in the bore to define therewith a pair of pressurizing chambers. Each chamber is connected to a separate brake circuit. The cylinder housing also has formed in it a pair of secondary reservoir chambers which are connected to the bore by compensation ports. A single primary reservoir chamber is formed by a stamped metal reservoir body which is secured to the cylinder housing over the secondary reservoir chambers so as to cover those chambers and seal them. Fluid transfer ports through the bottom of the reservoir body connect with the secondary reservoir chambers, and have their axes axially misaligned relative to the axes of the compensation ports so that fluid returning to the reservoirs through the compensation ports will not be able to enter the primary reservoir chamber when a squirting action takes place.
    Type: Grant
    Filed: October 23, 1973
    Date of Patent: February 10, 1976
    Assignee: General Motors Corporation
    Inventors: Carl A. Bierlein, Ernest D. Schaefer