Patents by Inventor Otto Pickermann

Otto Pickermann 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).

  • Asphalt production
    Patent number: 4276093
    Abstract: Methods of manufacturing and re-processing asphalt in which bitumen for the asphalt is heated by use of a microwave oven. Re-processed asphalt is recycled in a microwave oven in a closed vessel.
    Type: Grant
    Filed: August 31, 1978
    Date of Patent: June 30, 1981
    Inventor: Otto Pickermann