Patents by Inventor Martin Robert Gray

Martin Robert Gray 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).

  • Process of preparing 2,2'-(1-methyl-1,2-ethanediylidene) bis[hydrazinecarboximidamide]
    Patent number: 5659083
    Abstract: Process for the preparation of 2,2'-(1-methyl-1,2-ethanediylidine)bis[hydrazine carboximidamide] bya) removing impurities from aminoguanidine bicarbonate;b) reacting the aminoguanidine bicarbonate with methylglyoxal dimethyl acetal in an aqueous isopropyl medium; andc) purifying the 2,2'-(1-methyl-1,2-ethanediylidene)bis[hydrazine carboximidamide] by crystallization from an acidic aqueous-isopropanol medium.
    Type: Grant
    Filed: May 30, 1996
    Date of Patent: August 19, 1997
    Assignee: Sanofi
    Inventors: Richard Philion, Martin Robert Gray