Patents by Inventor Leonhard Doerner

Leonhard Doerner 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).

  • Electric radiant heater
    Patent number: 5223697
    Abstract: The rim of an electric radiant heater is formed by a multilayer body (13). It can have the cross-sectional shape of a U, whose interior is filled with a good insulating material. In the interior (23) is placed a sensor coil (23) for a pot detection system, where it is well shielded against heat and mechanical influences.
    Type: Grant
    Filed: December 6, 1991
    Date of Patent: June 29, 1993
    Assignee: E.G.O. Elektro-Gerate Blanc u. Fischer
    Inventors: Eugen Wilde, Erich Wagner, Leonhard Doerner, Robert Kicherer
  • Radiant heater, as well as method and apparatus for its production
    Patent number: 5196678
    Abstract: A radiant heater with partly embedded and otherwise projecting heating coils (16) is produced in that the coils (16) are placed in grooves (14) of a tool or mould (13), the interior of the heating coils is partly filled with a filling material (17) and then the dry, pourable insulating material is pressed thereon. Thus, the filling material forms a counter-die and is removed on taking the compressed insulator (21) out of apparatus (11) in that it drops between the heating coils.
    Type: Grant
    Filed: April 24, 1991
    Date of Patent: March 23, 1993
    Assignee: E.G.O. Elektro-Gerate Blanc u. Fischer
    Inventor: Leonhard Doerner
  • Method of making a radiant heater
    Patent number: 5048176
    Abstract: A radiant heater with partly embedded and otherwise projecting heating coils (16) is produced in that the coils (16) are placed in grooves (14) of a tool or mold (13), the interior of the heating coils is partly filled with a filling material (17) and then the dry, pourable insulating material is pressed thereon. Thus, the filling material forms a counter-die and is removed on taking the compressed insulator (21) out of apparatus (11) in that it drops between the heating coils.
    Type: Grant
    Filed: July 25, 1989
    Date of Patent: September 17, 1991
    Assignee: E.G.O. Elektro-Gerate Blanc u. Fischer
    Inventor: Leonhard Doerner