Patents by Inventor Kurt Bergelin

Kurt Bergelin 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: 4939901
    Abstract: A tandem master cylinder for hydraulic brake systems of automotive vehicles comprising a housing in whose bore a first and a second piston are sealingly and slidably disposed. The piston in the inactive position abut on stops in the housing under the action of a first and a second resetting spring and which, within the bore, confine a first and a second pressure chamber which are in communication with a first and a second unpressurized supply chamber via central valves that are open when in the inactive position. The first piston-resetting spring is anchored on the second piston, and its spring rate is greater than the spring rate of the second piston-resetting spring.
    Type: Grant
    Filed: October 21, 1988
    Date of Patent: July 10, 1990
    Assignee: Alfred Teves GmbH
    Inventors: Kurt Saalbach, Kurt Bergelin