Patents by Inventor Rudolf Wehr

Rudolf Wehr 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).

  • Polycaprolactam with titanium dioxide content
    Patent number: 4879120
    Abstract: A TiO.sub.2 -containing polycaprolactam contains, based on TiO.sub.2, less than 0.1% by weight of 100.degree. C. water solubles and from 2 to 15% by weight of monomeric caprolactam and oligomers thereof, based on polycaprolactam.
    Type: Grant
    Filed: August 25, 1988
    Date of Patent: November 7, 1989
    Assignee: BASF Aktiengesellschaft
    Inventor: Rudolf Wehr
  • Preparation of dry polycaprolactam granules
    Patent number: 4642211
    Abstract: Dry polycaprolactam granules containing from 8 to 13% by weight of caprolactam and its oligomers are prepared by a method in which a caprolactam melt is extruded, the extrudates are cooled to 100.degree.-150.degree. C., left at this temperature until the polycaprolactam has substantially crystallized, and then immediately granulated, and the granules are left in a stream of inert gas, in the absence of molecular oxygen, for from 1 to 4 hours at from 100.degree. to 150.degree. C., and are then cooled.
    Type: Grant
    Filed: October 19, 1984
    Date of Patent: February 10, 1987
    Assignee: BASF Aktiengesellschaft
    Inventors: Peter Elbs, Wolfgang-Dieter Jeserich, Rudolf Wehr