Patents by Inventor Dan W. Ericson

Dan W. Ericson 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).

  • Patrix for the production of a gold core for a prepared root-filled tooth
    Patent number: 4355978
    Abstract: In a method for the production of a gold core for a prepared root-filled tooth, the prepared root canal of the tooth is filled with a gasifiable setting impression material. A prefabricated core patrix, preferably of plastic, which consists of a core portion and a dowel portion, is inserted in the impression material which is allowed to set around the dowel portion for the formation of a core pattern. The core pattern is removed from the tooth and is embedded in a mold material which is heated for the gasification of the pattern, whereupon a gold core is cast in the mold formed after the gasification of the pattern.A core patrix for the production of a gold core for a prepared root-filled tooth is made as a single piece and consists of a core portion and a dowel portion which has a substantially smaller transverse dimension than the prepared root canal of the tooth. The core patrix is preformed and consists of a gasifiable material.
    Type: Grant
    Filed: October 16, 1980
    Date of Patent: October 26, 1982
    Inventor: Dan W. Ericson
  • Base for matrix band retainer
    Patent number: D277504
    Type: Grant
    Filed: March 19, 1982
    Date of Patent: February 5, 1985
    Inventor: Dan W. Ericson
  • Matrix band retainer
    Patent number: D277888
    Type: Grant
    Filed: March 19, 1982
    Date of Patent: March 5, 1985
    Inventor: Dan W. Ericson