Patents by Inventor Mohan R. Gownder

Mohan R. Gownder 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).

  • Bicomponent fibers of syndiotactic polypropylene
    Patent number: 7087301
    Abstract: Bicomponent fibers of syndiotactic polypropylene and ethylene-propylene random copolymer, can be prepared. The bicomponent fibers may exhibit self-crimp properties and high shrinkage characteristics.
    Type: Grant
    Filed: December 16, 2004
    Date of Patent: August 8, 2006
    Assignee: Fina Technology, Inc.
    Inventors: Michael Musgrave, Mohan R. Gownder, Jay Nguyen
  • Bicomponent fibers of isotactic and syndiotactic polypropylene
    Patent number: 6846561
    Abstract: Bicomponent fibers of isotactic polypropylene and syndiotactic polypropylene, methods of making such fibers and products made thereof are disclosed. Embodiments of the bicomponent fibers can exhibit self-crimp properties and high shrinkage characteristics.
    Type: Grant
    Filed: August 6, 2003
    Date of Patent: January 25, 2005
    Assignee: Fina Technology, Inc.
    Inventors: Mohan R. Gownder, Michael Musgrave, Jay Nguyen
  • Bicomponent fibers of isotactic and syndiotactic polypropylene, methods of making, products made thereof
    Patent number: 6395392
    Abstract: Bicomponent fibers of isotactic polypropylene and syndiotactic polypropylene, methods of making such fibers and products made thereof.
    Type: Grant
    Filed: May 22, 2000
    Date of Patent: May 28, 2002
    Assignee: Fina Research, S.A.
    Inventor: Mohan R. Gownder
  • Polypropylene fibers
    Patent number: 6146758
    Abstract: Process for the production of polypropylene fibers from polypropylene polymers produced by the polymerization of polypropylene in the presence of a metallocene catalyst characterized by a bridged racemic bis(indenyl) ligand substituted at the proximal position. The polypropylene contains 0.5 to 2% 2,1 insertions and has an isotacticity of at least 95% meso diads and is heated to a molten state and extruded to form a fiber preform. The preform is subjected to spinning at a spinning speed of at least 500 meters per minutes and subsequent drawing at a speed of at least 1,500 meters per minute to provide a draw ratio of at least 3 to produce a continuous polypropylene fiber. The draw speed and/or the draw ratio can be varied to produce fibers of different mechanical properties. Different polypropylene polymers produced by different metallocene catalysts can be used. Such fibers can be characterized by having an elongation at break of at least 100% and a specific toughness of at least 0.5 grams per denier.
    Type: Grant
    Filed: May 3, 1999
    Date of Patent: November 14, 2000
    Assignee: Fina Technology, Inc.
    Inventors: Mohan R. Gownder, Eduardo E. Zamora, Jay Nguyen
  • Process of making a bicomponent fiber
    Patent number: 6074590
    Abstract: Bicomponent fibers of isotactic polypropylene and syndiotactic polypropylene, methods of making such fibers and products made thereof.
    Type: Grant
    Filed: July 28, 1997
    Date of Patent: June 13, 2000
    Assignee: Fina Technology, Inc.
    Inventor: Mohan R. Gownder
  • Process of making polypropylene fiber
    Patent number: 5908594
    Abstract: Process for the production of polypropylene fibers from polypropylene polymers produced by the polymerization of polypropylene in the presence of a metallocene catalyst characterized by a bridged racemic bis(indenyl) ligand substituted at the proximal position. The polypropylene contains 0.5 to 2% 2,1 insertions and has an isotacticity of at least 95% meso diads and is heated to a molten state and extruded to form a fiber preform. The preform is subjected to spinning at a spinning speed of at least 500 meters per minutes and subsequent drawing at a speed of at least 1,500 meters per minute to provide a draw ratio of at least 3 to produce a continuous polypropylene fiber. The draw speed and/or the draw ratio can be varied to produce fibers of different mechanical properties. Different polypropylene polymers produced by different metallocene catalysts can be used. Such fibers can be characterized by having an elongation at break of at least 100% and a specific toughness of at least 0.5 grams per denier.
    Type: Grant
    Filed: September 24, 1997
    Date of Patent: June 1, 1999
    Assignee: Fina Technology, Inc.
    Inventors: Mohan R. Gownder, Eduardo E. Zamora, Jay Nguyen