Patents by Inventor Harald Gumbel

Harald Gumbel 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).

  • Treated polyester fabric for use in flexible abrasives
    Patent number: 4386943
    Abstract: A treated polyester fabric for use as a carrier for a flexible abrasive is impregnated with a substance which comprises at least one amine formaldehyde resin. Preferably, in the dry state, the impregnating substance comprises at least 10% by weight of the resin(s), and weighs at least 20% of the weight of the fabric alone. Urea and melamine formaldehyde resins are particularly useful.
    Type: Grant
    Filed: June 30, 1980
    Date of Patent: June 7, 1983
    Assignee: Vereinigte Schmirgel- und Machinen Fabriken Aktiengesellschaften
    Inventors: Harald Gumbel, Gunter Bigorajski