Patents by Inventor Robert Drogin

Robert Drogin 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).

  • Carbamate process
    Patent number: 4321402
    Abstract: In the process of producing an aromatic polyisocyanate from a methylated benzene compound having the sequential steps of ammoxidation, hydrolysis, conversion of amide to carbamate, condensation and conversion of polycarbamate ester to polyisocyanate, the improvement of converting said amide to said carbamate in a one-step reaction wherein said amide is reacted with an N-halogenating agent in the presence of alcohol and in a reaction medium having a pH of from neutral to basic and a temperature greater than 40.degree. C.
    Type: Grant
    Filed: August 18, 1980
    Date of Patent: March 23, 1982
    Assignee: Exxon Research & Engineering Co.
    Inventors: Ji-Yong Ryu, Krishna K. Rao, Ralph J. Spohn, Robert Drogin