Patents by Inventor Joachim Fiegel

Joachim Fiegel 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).

  • Process for dyeing polyamide fibres
    Patent number: 4295852
    Abstract: Polyamide fibre materials are dyed with acid dyestuffs and/or metal complex dyestuffs in the presence of compounds of the formula ##STR1## in which R represents a C.sub.4 -C.sub.12 -alkyl, C.sub.1 -C.sub.12 -alkoxy, phenyl, cyclohexyl or C.sub.2 -C.sub.10 -hydroxyalkoxy radical,R.sub.1 represents hydrogen or a C.sub.1 -C.sub.4 -alkyl radical,n represents an integer from 1 to 10 andm represents a number from 1 to n+1,or water-soluble salts thereof.
    Type: Grant
    Filed: November 3, 1980
    Date of Patent: October 20, 1981
    Assignee: Bayer Aktiengesellschaft
    Inventors: Klaus Walz, Joachim Fiegel