Patents by Inventor Warren F. Knoff

Warren F. Knoff 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: 7819994
    Abstract: This invention relates to a thin reinforced nonwoven fabric for fire blocking an article, articles containing such fabrics, and methods for making the fabrics and fire blocking the articles. When exposed to heat or flame, the fabric is capable of increasing its thickness by at least three times. The fabric comprises an open mesh scrim having a having crimped, heat-resistant organic fibers compressed thereon and held in a compressed state by a thermoplastic binder. When subjected to high heat or flame, the binder in the structure softens and flows, releasing the restrained crimped fibers and allowing the thickness of the fabric to increase dramatically.
    Type: Grant
    Filed: May 23, 2007
    Date of Patent: October 26, 2010
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Laurence N. Bascom, Warren F. Knoff
  • Publication number: 20090083910
    Abstract: Flame resistant fabrics useful as battings such as in mattresses and upholstery contain cellulose fibers (which retain at least 10 percent of their weight when heated in air to 700° C. at a rate of 20° C. per minute) and animal wool.
    Type: Application
    Filed: December 8, 2008
    Publication date: April 2, 2009
    Applicant: E. I. DU PONT DE NEMOURS AND COMPANY
    Inventors: Warren F. Knoff, Walter Randall Hall, III
  • Publication number: 20090070940
    Abstract: This invention relates to an improved gusset for use in fire-blocking a pillow-top mattress. This gusset provides additional fire blocking to provide a pillow-top mattress with improved performance when tested according to Technical Bulletin 603 of the State of California.
    Type: Application
    Filed: November 14, 2008
    Publication date: March 19, 2009
    Inventor: Warren F. Knoff
  • Patent number: 7421750
    Abstract: This invention relates to an improved gusset for use in fire-blocking a pillow-top mattress. This gusset provides additional fire blocking to provide a pillow-top mattress with improved performance when tested according to Technical Bulletin 603 of the State of California.
    Type: Grant
    Filed: November 3, 2005
    Date of Patent: September 9, 2008
    Assignee: E.I. du Pont de Nemours and Company
    Inventor: Warren F. Knoff
  • Patent number: 7229937
    Abstract: This invention relates to a thin reinforced nonwoven fabric for fire blocking an article, articles containing such fabrics, and methods for making the fabrics and fire blocking the articles. When exposed to heat or flame, the fabric is capable of increasing its thickness by at least three times. The fabric comprises an open mesh scrim having a having crimped, heat-resistant organic fibers compressed thereon and held in a compressed state by a thermoplastic binder. When subjected to high heat or flame, the binder in the structure softens and flows, releasing the restrained crimped fibers and allowing the thickness of the fabric to increase dramatically.
    Type: Grant
    Filed: March 23, 2004
    Date of Patent: June 12, 2007
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Laurence Nelson Bascom, Warren F. Knoff
  • Patent number: 7226877
    Abstract: This invention relates to a thin reinforced nonwoven fabric comprising a liquid impervious polymeric layer, a compressed web of crimped fiber, a binder, and a reinforcing scrim. The fabric bulks when exposed to heat or flame and is useful as a component for fire blocking mattresses, upholstery, and the like.
    Type: Grant
    Filed: December 27, 2004
    Date of Patent: June 5, 2007
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Laurence N. Bascom, Warren F. Knoff
  • Patent number: 5557915
    Abstract: An alternate twist plied yarn formed from a plurality of strands of singles yarn twisted in alternating directions in lengthwise intervals of first half-cycles of twist at a predetermined twist level followed by second half-cycles of twist at the same twist level with reversal nodes therebetween, the singles twisted yarns being ply-twisted together in alternating directions in lengthwise intervals of first half-cycles of ply-twist followed by second half-cycles of ply-twist, there being a bond formed adjacent each node wherein the first half-cycle of ply-twist is located within the bond and the second half-cycle of ply-twist originates at one end of the bond, the twist level in the singles twisted yarn is between 25% in the same direction and 60% in the opposite direction of the twist applied to the singles yarns before plying.
    Type: Grant
    Filed: November 14, 1994
    Date of Patent: September 24, 1996
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Warren F. Knoff, Robert W. McAllister, Peter Popper, Steven K. Shibata, Robert E. Taylor, Paul W. Yngve
  • Patent number: 5414987
    Abstract: A process for treating a ply-twisted crimped multifilament yarn. The process involves adjusting the temperature and moisture content of the yarn prior to passing the yarn through a stuffer box which is essentially free of steam. Excess hot fluid is removed from the yarn, and the yarn's temperature is adjusted to a temperature in the range of about 40.degree. to 90.degree. C. before the yarn is passed through the stuffer box. The yarns may be used for making a textured saxony-type carpets having a tightly tailored surface texture.
    Type: Grant
    Filed: September 30, 1993
    Date of Patent: May 16, 1995
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Warren F. Knoff, Theresa A. Weston
  • Patent number: 5325301
    Abstract: The present invention relates broadly to a method of image analysis for analyzing the texture of a surface, and to a saxony-type carpet having a tightly tailored surface texture characterized by this method. The method employs a model based on a second order co-occurrence matrix model which calculates a set of textural parameters for image classification. This co-occurrence matrix model examines the statistics of the spatial relationship between gray levels in a homogeneously textured image with calculated textural features which represent measures such as homogeneity and contrast. The method of the present invention uses this model to construct a set of normalized textural parameters from the textural parameters and calculates a value for the normalized textural parameters from this set, where the normalized textural parameters are related to the physical properties of the surface, such as pile lay of a carpet.
    Type: Grant
    Filed: March 27, 1992
    Date of Patent: June 28, 1994
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Warren F. Knoff, Michael J. Merrill, Barry Rubin, Akhileswar G. Vaidyanathan, James E. Van Trump, Theresa A. Weston
  • Patent number: 4909084
    Abstract: A single-filament specimen preparation fixture for preparing a multiplicity of tensile testing specimens from the same filament. The fixture can be used manually or it can be adapted for use as one element in an automatic testing system.
    Type: Grant
    Filed: February 2, 1989
    Date of Patent: March 20, 1990
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Warren F. Knoff