Patents by Inventor Henry A. Hoffman, Jr.

Henry A. Hoffman, Jr. 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 acrylic fiber
    Patent number: 4309475
    Abstract: Self-crimping bicomponent acrylic fibers comprising a nonhydrophilic component and a hydrophilic component in eccentric side-by-side relationship which in combination provide an equilibrium crimp reversibility (ECR) of at least about 20% have as the hydrophilic component a copolymer of acrylonitrile containing 0.7 to 1.2 mol percent 2-acrylamido-2-methylpropanesulfonic acid or salts thereof having a total ionizable group content of 180 to 270 milliequivalents per kilogram of copolymer.
    Type: Grant
    Filed: February 14, 1980
    Date of Patent: January 5, 1982
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Henry A. Hoffman, Jr.