Patents by Inventor Ernest Kallmann

Ernest Kallmann 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: 4968231
    Abstract: In order to produce oil-free compressed air with a rotary compressor while avoiding the costs involved by a liquid-free compressor, a rotary compressor, especially a single screw rotary compressor is injected with water in which borate, preferably potassium borate is dissolved. This prevents corrosion at no additional cost while improving the bacterial purity of the air produced.
    Type: Grant
    Filed: February 17, 1989
    Date of Patent: November 6, 1990
    Assignee: Bernard Zimmern
    Inventors: Bernard Zimmern, Ernest Kallmann