Patents by Inventor Hans F. Pfeiffer

Hans F. Pfeiffer 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 the enzymatic softening of furs
    Patent number: 4260686
    Abstract: The present invention concerns a process for the softening of furs while at the same time taking the greatest possible care of the appearance of the hair. The process of this invention comprises contacting a fur with an acid aqueous liquor containing an acid protease from a fungus strain of the genus Rhizopus rhizopodiformis, said acid protease being effective in the pH range of from about 2.5 to 6.5.
    Type: Grant
    Filed: August 17, 1979
    Date of Patent: April 7, 1981
    Assignee: Henkel Kommanditgesellschaft auf Aktien
    Inventors: Adolf Asbeck, Hans F. Pfeiffer, Juergen Plapper, Rolf Schmid
  • Process of producing acid stable protease
    Patent number: 4062732
    Abstract: An acid stable protease whose pH range of 50% of maximum activity is between pH 2.5 and 6.5, produced by culturing a fungus strain of the species Rhizopus rhizopodiformis CBS 227.75 under aerobic conditions in a nutrient medium containing assimilable carbon and nitrogen sources, at a pH between 3 and 7 and at a temperature between 25.degree. C and 50.degree. C, and separating the enzyme produced; as well as the method of production, its use as a foodstuff additive and foodstuffs containing the same.
    Type: Grant
    Filed: June 14, 1976
    Date of Patent: December 13, 1977
    Assignee: Henkel Kommanditgesellschaft auf Aktien
    Inventors: Rudolf Lehmann, Hans F. Pfeiffer, Joachim Schindler, Wolfgang Schreiber