Patents by Inventor Hans Gujer

Hans Gujer 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).

  • Method and device for the wet composting of organic sludge
    Patent number: 4072494
    Abstract: There is disclosed a method and apparatus for composting organic sludge by mixing the sludge with oxygen-containing gas in a gas impermeable, rotatable drum, and cooling the drum to maintain the temperature within the drum above but near the pasteurization temperature.
    Type: Grant
    Filed: August 7, 1975
    Date of Patent: February 7, 1978
    Inventor: Hans Gujer