Patents by Inventor Karl D. Scheffer

Karl D. Scheffer 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).

  • System and process for the abatement of casting pollution, reclaiming resin bonded sand, and/or recovering a low BTU fuel from castings
    Patent number: 4457352
    Abstract: Air is caused to flow through the resin bonded mold to aid combustion of the resin binder to form a low BTU gas fuel. Casting heat is recovered for use in a waste heat boiler or other heat abstraction equipment. Foundry air pollution is reduced, the burned portion of the molding sand is recovered for immediate reuse and savings in fuel and other energy is achieved.
    Type: Grant
    Filed: April 19, 1982
    Date of Patent: July 3, 1984
    Inventor: Karl D. Scheffer
  • System and process for abatement of casting pollution, reclaiming resin bonded sand, and/or recovering a low BTU fuel from castings
    Patent number: 4325424
    Abstract: A low vacuum is applied to selected surface areas of a resin bonded sand mold to draw ambient air into selected portions of the mold. The air entering the mold burns out a significant portion of the resin binder to form a low BTU gas fuel and to recover casting heat for use in a waste heat boiler or other heat abstractions device. Therefore, foundry air pollution is reduced, the burned out portion of the molding sand is recovered for immediate reuse, and a savings in fuel and energy.
    Type: Grant
    Filed: March 14, 1980
    Date of Patent: April 20, 1982
    Inventor: Karl D. Scheffer
  • Catalyst for curing resins
    Patent number: 4178429
    Abstract: Process and catalyst for curing resins (e.g. furans) comprising concentrated aqueous solutions of perchloric acid (about 45-72%) and the cured resins obtained using said catalyst. Improved catalyst combinations for curing resins in a process employing same and the cured resin produced thereby comprising concentrated perchloric acid, a small amount of phosphoric acid and/or a small amount of boric acid.
    Type: Grant
    Filed: November 17, 1978
    Date of Patent: December 11, 1979
    Inventor: Karl D. Scheffer