Patents by Inventor Walter D. Johnson

Walter D. Johnson 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).

  • Annealed polyester filaments and a process for making them
    Patent number: 4704329
    Abstract: A process for annealing drawn polyester filaments with saturated steam of at least about 150 psig provides products with a novel fine structure that results in an improved balance of strength, dyeability, shrinkage, crimpability and trimer in the product.
    Type: Grant
    Filed: December 17, 1986
    Date of Patent: November 3, 1987
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Jack A. Hancock, Walter D. Johnson, Alan D. Kennedy
  • Process of making crimped, annealed polyester filaments
    Patent number: 4639347
    Abstract: A process for annealing drawn polyester filaments with saturated steam of at least about 150 psig provides products with a novel fine structure that results in an improved balance of strength, dyeability, shrinkage, crimpability and trimer in the product.
    Type: Grant
    Filed: March 16, 1984
    Date of Patent: January 27, 1987
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Jack A. Hancock, Walter D. Johnson, Alan D. Kennedy