Patents by Inventor Alfred John Strohmaier

Alfred John Strohmaier 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: 4030880
    Abstract: Synthetic polycarbonamide filaments having more uniform acid dyeability are prepared in a melt-spinning and drawing process by applying a dye leveling agent to the filaments in a spin finish prior to drawing. Dye uniformity is improved with washfast, rate-sensitive acid dyes. The filaments may be processed conventionally prior to dyeing. Effective agents include sodium dodecyldiphenylether disulfonate and sulfated butyl oleate.
    Type: Grant
    Filed: October 9, 1975
    Date of Patent: June 21, 1977
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Winfried Thomas Holfeld, Alfred John Strohmaier