Patents by Inventor Ernest R. Schaefer

Ernest R. Schaefer 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).

  • Cat litter
    Patent number: 4723509
    Abstract: A material for use as cat litter comprising a composition of paper machine sludge combined in the presence of water with sodium bicarbonate and a hydraulic cement, dried and crushed to form coarse particles or extruded and chopped up to form pellets. Desirably, the composition includes an anti-static material and coloring.
    Type: Grant
    Filed: December 9, 1985
    Date of Patent: February 9, 1988
    Inventor: Ernest R. Schaefer
  • Oil scavenging material
    Patent number: 4497688
    Abstract: A material for scavenging oil slick and/or oleaginous fluids comprising paper-machine sludge combined in the presence of water with a hydraulic cement and dried.
    Type: Grant
    Filed: March 21, 1983
    Date of Patent: February 5, 1985
    Inventor: Ernest R. Schaefer