Patents by Inventor Richard W. Joos

Richard W. Joos 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: 5273559
    Abstract: An abrasive composition and dental articles made from same, the composition including abrasive particles dispersed throughout and entrapped within a polyurea or polyurethane urea matrix which contains soft and hard segments wherein the matrix is made from the polymerization reaction of a polyfunctional amine and a polyfunctional isocyanate. The abrasive dental articles include prophylactic cups and polishing wheels, points and discs.
    Type: Grant
    Filed: December 17, 1992
    Date of Patent: December 28, 1993
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: W. James Hammar, Richard W. Joos
  • Patent number: 4150012
    Abstract: A composition and method adapted for discernibly filling and sealing pits and fissures in tooth surfaces is described. The novel compositions contain finely divided hydrophobic opaquing filler and hydrophobic suspending agent, in defined amounts, in a polymerizable resin system. Placement of the composition on dental surfaces is simplified and retention is easily verified.
    Type: Grant
    Filed: January 21, 1977
    Date of Patent: April 17, 1979
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: Richard W. Joos