Patents by Inventor Ronald L. Hafer

Ronald L. Hafer 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).

  • Disperse dyeing of triacetate
    Patent number: 4255153
    Abstract: Textile materials containing at least 50% by weight triacetate fibers are dyed with disperse dyes in an aqueous dyebath containing an emulsifier and, as carrier, an aliphatic dicarboxylic acid diester having 6 to 24 carbon atoms, such as dibutyl maleate.
    Type: Grant
    Filed: September 27, 1979
    Date of Patent: March 10, 1981
    Assignee: Sandoz, Inc.
    Inventors: Eric Altherr, Ronald L. Hafer, Richard L. Pepin