Patents Represented by Law Firm Keil & Weikauf
  • Fire protection covers made of melamine-formaldehyde resin fibers
    Patent number: 6004892
    Abstract: Melamine resin fibers are used for manufacturing fire-safety blankets.
    Type: Grant
    Filed: May 12, 1997
    Date of Patent: December 21, 1999
    Assignee: BASF Aktiengesellschaft
    Inventors: Erhard Guenther, Wolfgang Reuther
  • Method of purifying ferment-produced riboflavin
    Patent number: 5210023
    Abstract: A method of purifying ferment-produced riboflavin, wherein the impure riboflavin is suspended in water or dilute aqueous acid, and the suspension is heated at a temperature of from 75.degree. to 130.degree. C. for from 0.3 to 3 hours with stirring, during which time crystal transformation takes place, after which the mixture is cooled and the purified product is isolated in known manner.
    Type: Grant
    Filed: July 1, 1991
    Date of Patent: May 11, 1993
    Assignee: BASF Aktiengesellschaft
    Inventors: Johannes Grimmer, Hans Kiefer, Christoph Martin