Patents by Inventor Felix G. Janssen

Felix G. Janssen 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).

  • Microbial acoustical tiles
    Patent number: 5744230
    Abstract: Acoustical tiles having incorporated therein microbicidal amounts of a microbicide are effective in inhibiting growth of micro-organisms (including viruses) in the tile pores and preventing spread of disease, cross-infections, and food contamination in facilities employing acoustical tiles.
    Type: Grant
    Filed: July 15, 1994
    Date of Patent: April 28, 1998
    Inventor: Felix G. Janssen
  • Rigid filter plate and process for manufacture of the same
    Patent number: 4452698
    Abstract: An improved rigid filter plate for sludge dewatering is comprised of a filter element of two or more sizes within the range of 0.2 to 0.002 inch of irregular hard particles of aluminum oxide or similar materials, and of a supporting element of larger particles all bonded with an adhesive bonding agent. A process for manufacturing the improved rigid filter plate is also set forth.
    Type: Grant
    Filed: May 2, 1983
    Date of Patent: June 5, 1984
    Assignee: U.S. Environmental Products, Inc.
    Inventors: Robert L. Roberts, Felix G. Janssen
  • Rigid filter plate and process for manufacture of the same
    Patent number: 4381998
    Abstract: An improved rigid filter plate for sludge dewatering is comprised of a filter element of two or more sizes within the range of 8 to 100 grid of jagged, irregular hard particles of aluminum oxide or similar materials, and of a supporting element of larger particles all bonded with an adhesive bonding agent. The particles in the filtering element increase in average diameter progressing from the upper surface to the lower surface of the element. A process for manufacturing the improved rigid filter plate is also set forth.
    Type: Grant
    Filed: August 27, 1981
    Date of Patent: May 3, 1983
    Assignee: U.S. Environmental Products, Inc.
    Inventors: Robert L. Roberts, Felix G. Janssen