Patents by Inventor Siegfried Wirth

Siegfried Wirth 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).

  • Arrangement for holding a catalyst in a housing in an exhaust system of a liquid fuel-operated motor
    Patent number: 4958491
    Abstract: The holding of a catalytically-active monolith in a housing in the exhaust line of a liquid fuel-operated motor is done by a holder made of a knitting wrapped about a catalyst monolith. The knitting includes a segment with an undeformed thread area, where one or more sealing strips are accommodated, so that the holding qualities are improved with good prevention of a by-passing gas flow about the monolith, and the sealing strip is protected against abrasion and destruction and is securely retained in its position.
    Type: Grant
    Filed: March 28, 1988
    Date of Patent: September 25, 1990
    Assignee: J. Eberspacher
    Inventors: Georg Wirth, Siegfried Wirth
  • N-Acyloyl-N-alkyl-alkylenediamines as dye levelers
    Patent number: 3999942
    Abstract: N-Acyloyl-N'-alkyl-alkylenediamines of the formula ##STR1## are prepared by reacting N-alkyl alkylenediamines with a derivative of a di-carboxylic acid. The compounds and their salts are useful as levelling auxiliaries for the dyeing of polyacrylonitrile or polyester with basic dyestuffs. Advantageously, the compounds are employed in conjunction with a non-ionic dispersing agent, for example a polyethoxylated fatty alcohol, and a solvent to give an electrolyte-insensitive dye bath.
    Type: Grant
    Filed: April 17, 1975
    Date of Patent: December 28, 1976
    Assignee: Cassella Farbwerke Mainkur Aktiengesellschaft
    Inventors: Christian Heid, Karl-Heinz Keil, Joachim Ribka, Otto Trosken, Gerhard Weckler, Siegfried Wirth