Patents Represented by Attorney, Agent or Law Firm Keil & Weinkaup
  • Method for producing polyamides from aminonitriles
    Patent number: 6359020
    Abstract: Aqueous monomer and oligomer extracts obtained from polyamide production by extraction of the polymer with water are used for producing polyamides by direct reaction with aminonitriles.
    Type: Grant
    Filed: July 11, 2000
    Date of Patent: March 19, 2002
    Assignee: BASF Aktiengesellschaft
    Inventor: Ralf Mohrschladt
  • Method for concentrating and purifying hirudin from leeches
    Patent number: 5304310
    Abstract: A method for the concentration and purification of biomolecules is described and comprises introducing the biomolecule into an aqueous/organic solvent system and bringing about a phase separation by addition of salts, where the pH at which the concentration takes place, the solvents suitable for the aqueous/organic solvent system, and the nature of the salt are determined in a series of tests one embodiment concerns concentration of hirudin by using propanol, butanol or acetone a the solvent and sodium chloride as the salt.
    Type: Grant
    Filed: July 19, 1992
    Date of Patent: April 19, 1994
    Assignee: BASF Aktiengesellschaft
    Inventors: Kurt Lang, Andreas Kreimeyer