Patents by Inventor Karl Schaaf

Karl Schaaf 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: 4362183
    Abstract: A spring loaded safety valve includes a control device which admits the pressurized medium to a supplemental loading system which consists of a spring housing which serves as a cylinder for a spring retainer which serves as a supplemental loading piston that is arranged about two adjustable sleeves which are arranged around the valve stem and which control the response pressure and the supplemental loading of the valve spring.
    Type: Grant
    Filed: June 23, 1980
    Date of Patent: December 7, 1982
    Assignee: Bopp & Reuther GmbH
    Inventors: Herbert Richter, Karl Schaaf