Patents by Inventor Cathy J. Hamilton

Cathy J. Hamilton 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).

  • Process for making elastic stretch woven fabric
    Patent number: 5478514
    Abstract: An improved process is provided for weaving an elastic stretch fabric. The fabric is woven with weft and/or warp yarns that are combination yarns which comprise a partially oriented synthetic crystalline polymer yarn combined with an elastomeric core. The fabric is then stretched, heat set and finished under particular conditions to provide the resultant fabric with an elastic stretch of 18 to 45% and dimensions about equal to the as-woven dimensions.
    Type: Grant
    Filed: November 10, 1994
    Date of Patent: December 26, 1995
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Cathy J. Hamilton
  • Polyesters and their use in compostable products such as disposable diapers
    Patent number: 5171308
    Abstract: The invention provides novel polyesters, fibers and films, nonwovens from the fibers and disposable products of the polyesters such as diapers. The products are degradable under the conditions typically existing in waste composting processes, have low ingredient costs and yet provide strength and toughness properties adequate for end uses such as in disposable diapers. The polyesters are based upon polyethylene terephthalate copolymerized with a non-aromatic diacid, such as adipic and glutaric acids, and containing alkali metal or alkaline earth metal sulfo groups, such as a metal 5-sulfoisophthalic acid derivative.
    Type: Grant
    Filed: February 13, 1992
    Date of Patent: December 15, 1992
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Francis G. Gallagher, Cathy J. Hamilton, Steven M. Hansen, Hyunkook Shin, Raymond F. Tietz
  • Polyesters and their use in compostable products such as disposable diapers
    Patent number: 5171309
    Abstract: The invention provides novel polyesters, fibers and films, nonwovens from the fibers and disposable products of the polyesters such as diapers. The products are degradable under the conditions typically existing in waste composting processes, have low ingredient costs and yet provide strength and toughness properties adequate for end uses such as in disposable diapers. The polyesters are based upon polyethylene terphthalate copolymerized with a cycloaliphatic diacid, preferably hexahydroterephthalic acid, and containing alkali metal or alkaline earth metal sulfo groups, such as a metal 5-sulfoisophthalic acid derivative.
    Type: Grant
    Filed: February 13, 1992
    Date of Patent: December 15, 1992
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Francis G. Gallagher, Cathy J. Hamilton, Steven M. Hansen, Hyunkook Shin, Raymond F. Tietz
  • Novel polyesters and their use in compostable products such as disposable diapers
    Patent number: 5097004
    Abstract: The invention provides a novel polyesters, fibers and films, nonwovens from the fibers and disposable products of the polyesters such as diapers. The products are degradable under the conditions typically existing in waste composting processes, have low ingredient costs and yet provide strength and toughness properties adequate for end uses such as in disposable diapers. The polyesters are based upon polyethylene terephthalate copolymerized with a polyethylene glycol and a 5-sulfoisophthalic acid and, if desired, a polyethylene ether such as diethylene glycol.
    Type: Grant
    Filed: January 25, 1991
    Date of Patent: March 17, 1992
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Francis G. Gallagher, Cathy J. Hamilton, Raymond F. Tietz