Patents by Inventor William Otsen

William Otsen 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).

  • Method of manufacturing superelastic endodontic files and files made therefrom
    Patent number: 6315558
    Abstract: A method of forming a superelastic endodontic file by grinding a superelastic wire to form a file blank, and rotating a first end of the blank while preventing rotation of a second end of the blank is disclosed. The file blank is maintained in the austenite phase until twisted to form a stress induced martensite which is plastically deformed by the twisting. A heat treatment step may be performed prior to twisting, during twisting or after twisting of the preform. The method disclosed allows for increased flexibility in the design of files including the production of a rhomboid superelastic file.
    Type: Grant
    Filed: October 26, 1999
    Date of Patent: November 13, 2001
    Assignee: Ormco Corporation
    Inventors: Farrokh Farzin-Nia, William Otsen
  • Superelastic endodontic instrument, method of manufacture, and apparatus therefor
    Patent number: 6149501
    Abstract: A superelastic endodontic instrument, such as a file, is formed by grinding a superelastic wire to form a file preform or blank, and rotating a first end of the blank while preventing rotation of a second end of the blank. The file blank is maintained in the austenite phase at least until twisted to form a stress induced martensite which is plastically deformed by the twisting. A heat treatment step may be performed prior to twisting, during twisting or after twisting of the preform. The file blank may be heated by electrical heating methods or by submerging the blank in a heated liquid.
    Type: Grant
    Filed: January 27, 1998
    Date of Patent: November 21, 2000
    Assignee: Kerr Corporation
    Inventors: Farrokh Farzin-Nia, William Otsen, Gary Garman
  • Method of manufacturing superelastic endodontic files and files made therefrom
    Patent number: 5984679
    Abstract: A method of forming a superelastic endodontic file by grinding a superelastic wire to form a file blank, and rotating a first end of the blank while preventing rotation of a second end of the blank is disclosed. The file blank is maintained in the austenite phase until twisted to form a stress induced martensite which is plastically deformed by the twisting. A heat treatment step may be performed prior to twisting, during twisting or after twisting of the preform. The method disclosed allows for increased flexibility in the design of files including the production of a rhomboid superelastic file.
    Type: Grant
    Filed: September 26, 1997
    Date of Patent: November 16, 1999
    Assignee: Ormco Corporation
    Inventors: Farrokh Farzin-Nia, William Otsen