Patents by Inventor Rudolf M. Hempel

Rudolf M. Hempel 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).

  • Device to automatically add a controlled amount of corrosion inhibitor in an engine cooling system
    Patent number: 4338959
    Abstract: Means for adding corrosion inhibitor to an engine cooling system utilizing a corrosion detector in contact with the circulating coolant and which is in an electronic circuit to activate a control valve which controls the feeding of corrosion inhibitor solution from a reservoir that is in selective communication with the coolant system. The corrosion detector may be in the form of a probe that measures solution potential or electrical resistance of a metal wire as it corrodes due to the corrosiveness of the coolant. The corrosion inhibitor reservoir is located either in communication with the line between the radiator and coolant reservoir or in a by-pass line parallel with the radiator.
    Type: Grant
    Filed: October 29, 1980
    Date of Patent: July 13, 1982
    Assignee: Borg-Warner Corporation
    Inventors: Robert H. Krueger, Robert R. Kelly, Rudolf M. Hempel, Bruce P. Miglin