Patents by Inventor Leonard A. Tushaus

Leonard A. Tushaus 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).

  • Block copolymer, method of making the same, diamine precursors of the same, method of making such diamines and end products comprising the block copolymer
    Patent number: 5512650
    Abstract: Block copolymers having a repeating unit comprised of polysiloxane and urea segments are prepared by copolymerizing certain diaminopolysiloxanes with diisocyanates. The invention also provides novel diaminopolysiloxanes useful as precursors in the preparation of the block copolymers and methods of making such diaminopolysiloxanes. Pressure sensitive adhesive compositions comprising the block copolymer are also provided as are sheet materials coated with the same.
    Type: Grant
    Filed: July 21, 1993
    Date of Patent: April 30, 1996
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Charles M. Leir, Jerome J. Hoffman, Leonard A. Tushaus, Gary T. Wiederholt, Mjeczyslaw H. Mazurek, Audrey A. Sherman, William R. Bronn
  • Organopolysiloxane-polyurea block copolymer release agents
    Patent number: 5290615
    Abstract: Block copolymers having a repeating unit comprised of polysiloxane and urea segments are prepared by copolymerizing certain diaminopolysiloxanes with diisocyanates. The invention also provides novel diaminopolysiloxanes useful as precursors in the preparation of the block copolymers and a method of making such diaminopolysiloxanes. Pressure-sensitive adhesive compositions comprising the block copolymer are also provided as are sheet materials coated with the same.
    Type: Grant
    Filed: August 31, 1992
    Date of Patent: March 1, 1994
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Leonard A. Tushaus, Gary T. Widerholt
  • Block copolymer, method of making the same, dimaine precursors of the same, method of making such diamines and end products comprising the block copolymer
    Patent number: 5214119
    Abstract: Block copolymers having a repeating unit comprised of polysiloxane and urea segments are prepared by copolymerizing certain diaminopolysiloxanes with diisocyanates. The invention also provides novel diaminopolysiloxanes useful as precursors in the preparation of the block copolymers and a method of making such diaminopolysiloxanes. Pressure sensitive adhesive compositions comprising the block copolymer are also provided as are sheet materials coated with the same.
    Type: Grant
    Filed: November 16, 1990
    Date of Patent: May 25, 1993
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Charles M. Leihr, Leonard A. Tushaus, Jerome J. Hoffman, Gary Wiederholt