Patents by Inventor Max Perrig

Max Perrig 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 cotton with reactive dyes in weakly alkaline dye-bath(pH 8.0-8.8)
    Patent number: 4408997
    Abstract: Cellulosic fabrics may be dyed by cold-dyeing reactive dyes under weakly alkaline conditions (0.2-1 g/l soda) at 60.degree.-80.degree. C. in the presence of moderate amounts of salt. This is advantageously used for the dyeing of mixed cotton/polyester substrates in a one-bath process with a mixture of reactive and disperse dyes.
    Type: Grant
    Filed: October 28, 1981
    Date of Patent: October 11, 1983
    Assignee: Sandoz Ltd.
    Inventor: Max Perrig
  • Simultaneous dyeing and bonding of polyamide fibers
    Patent number: 4147508
    Abstract: Disclosed is a process for the production of a simultaneously dyed and bonded polyamide fibre band which comprises saturating an untwisted polyamide fibre band with an aqueous liquor containing dyestuff and malic, tartaric or citric acid, applying pressure to the band to compact same and remove excess liquor, and subjecting the compacted band to elevated temperatures to cause bonding and dye fixation.
    Type: Grant
    Filed: September 26, 1977
    Date of Patent: April 3, 1979
    Assignee: Sandoz Ltd.
    Inventor: Max Perrig