Patents by Inventor Christophew Rochin

Christophew Rochin 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).

  • Preparation of methylenedi(phenylurethane)
    Patent number: 5066827
    Abstract: Methylenedi(phenylurethane), MDU, is selectively prepared by condensing an alkyl N-phenylcarbamate with a methylenating agent, e.g., formaldehyde or a precursor thereof, in the presence of a catalytically effective amount of the protonic acid, hydrofluoric acid.
    Type: Grant
    Filed: June 29, 1990
    Date of Patent: November 19, 1991
    Assignee: Rhone-Poulenc Chimie
    Inventors: Michel Gubelmann, Christophew Rochin, Christian Allandrieu