Patents by Inventor Rolf Grebenstein

Rolf Grebenstein 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).

  • Liquid epoxy resin composition containing wollastonite and calcite
    Patent number: 5872163
    Abstract: Epoxy resin casting compositions comprising(a) a liquid aromatic glycidyl or .beta.-methylglycidyl ether or a liquid mixture of several aromatic glycidyl or .beta.-methylglycidyl ethers containing on average more than one glycidyl ether group per molecule,(b) one or more than one acid hardener for the glycidyl ether,(c) a curing accelerator,(d) a filler mixture containing calcite and wollastonite in an amount from 40 to 60% by weight, based on components (a), (b) and (d), and as optional components,(e) customary additives for epoxy resin casting compositions are suitable in particular for coating or encapsulating electrical or electronic components and, more particularly, electrical ignition coils.
    Type: Grant
    Filed: October 28, 1996
    Date of Patent: February 16, 1999
    Assignee: Ciba Specialty Chemicals Corporation
    Inventors: Werner Hollstein, Werner Pfander, Irene Jennrich, Rolf Grebenstein