Patents by Inventor Helmut H. Zapfe

Helmut H. Zapfe 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).

  • Vapor permeation curable coatings for surface-porous substrates
    Patent number: 4368222
    Abstract: Disclosed is an improved method for coating a surface-porous substrate, e.g. an SMC substrate, with a film of curable coating composition and curing said film. The improvement comprises applying a film of the coating composition to the substrate wherein the coating composition comprises a phenol-functional compound and a multi-isocyanate curing agent therefor, and exposing the coated substrate to a vaporous tertiary amine catalyst to cure the applied film.
    Type: Grant
    Filed: June 5, 1981
    Date of Patent: January 11, 1983
    Assignee: Ashland Oil, Inc.
    Inventors: James R. Blegen, Helmut H. Zapfe, Eugene L. Bulgozdy