Patents by Inventor Armin Kumpart

Armin Kumpart 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).

  • Cleaning aluminum workpieces
    Patent number: 5997721
    Abstract: A method of cleaning an Al workpiece comprises a.c. anodising the workpiece in an acidic electrolyte capable of dissolving aluminium oxide and maintained at a temperature of at least 70.degree. C. under conditions such that the surface of the workpiece is cleaned with any oxide film thereon being non-porous and no more than about 20 nm thick.
    Type: Grant
    Filed: October 16, 1997
    Date of Patent: December 7, 1999
    Assignee: ALCAN International Limited
    Inventors: Peter Karl Ferdinand Limbach, Armin Kumpart, Nigel Cleaton Davies, Jonathan Ball