Patents by Inventor Karl R. Engquist

Karl R. Engquist 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).

  • Patent number: 4612767
    Abstract: Heat shield assemblies are normally connected to engines which have exhaust systems in order to reduce the temperature of the outer surface. The skin temperature of the outer surface of the heat shield assembly must be cooled so that persons coming in contact with such a surface is not burned. The subject heat shield assembly includes a heat source, an inner member and an outer member which respectively define first and second cooling flow paths. The first cooling flow path being adapted to convect heat away from the heat source and the inner member as air passes therethrough and the second cooling flow path being adapted to convect heat away from the inner member and the outer member as air passes therethrough. The air passing through the first and second cooling flow paths effectively reduces the temperature of the outer member so that no one would be burned upon contact therewith.
    Type: Grant
    Filed: March 1, 1985
    Date of Patent: September 23, 1986
    Assignee: Caterpillar Inc.
    Inventors: Karl R. Engquist, Keith K. Klintworth
  • Patent number: 4182122
    Abstract: An exhaust manifold for an internal combustion engine is provided with internal insulation so as to maintain the outside skin temperature preferably below 450.degree. F. The manifold is provided with an exhaust conduit or lining that is comprised of interfitting relatively axially movable sections in contact with the exhaust gases. A low specific gravity or porous sleeve of insulating material is fitted in slightly spaced relationship around the exhaust conduit. The sleeve of insulating material may be wrapped to prevent the metal of the outer cast manifold housing from penetrating the insulation. Each section of the exhaust conduit has a branch for connection to a flanged nipple which is permitted some limited movement relative to the manifold housing when connected to the exhaust ports of the engine.
    Type: Grant
    Filed: February 15, 1978
    Date of Patent: January 8, 1980
    Assignee: Caterpillar Tractor Co.
    Inventors: Michael K. Stratton, Karl R. Engquist, Frank E. Keske, Harold C. Powers, James D. Sparks
  • Patent number: 4168610
    Abstract: A manifold for internal combustion engines is provided which has a unique insulation system for maintaining a skin temperature of the manifold below 400.degree. F. The manifold includes an exhaust conduit made up of axially spaced and aligned segments with provision for preventing excessive leakage of exhaust gases between the spaced segments. Each segment has an exhaust port extending at an angle thereto. Two or more members of corrugated or crumpled thin foil are concentrically arranged about the ports and about the conduit with air gaps between the conduit and the innermost member, between the port and the innermost member, and between each member. An outer casing is cast about the members and embeds the ends of the members therein. The foil from which the members are made is polished on the surfaces to be highly reflective thereby reducing the transfer of heat through the successive concentric members. A method of manufacturing the improved insulated manifold is provided.
    Type: Grant
    Filed: March 29, 1978
    Date of Patent: September 25, 1979
    Assignee: Caterpillar Tractor Co.
    Inventor: Karl R. Engquist