Patents by Inventor Geoffrey P. R. Carr

Geoffrey P. R. Carr 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).

  • Stable crystal form of 1,4-dihydro-2-(imidazolyl-1-ylmethyl)-6-methyl-4-(3-nitrophenyl)pyridine -3,5-dicarboxylic acid 3-ethyl 5-methyl diester, hydrochloride
    Patent number: 4983617
    Abstract: The invention concerns a new stable crystal form of anhydrous, crystalline 1,4-dihydro-2-(imidazol-1-ylmethyl)-6-methyl-4-(3-nitrophenyl)pyridine)-3, 5-dicarboxylic acid 3-ethyl 5-methyl diester hydrochloride, "having a melting point greater than about 215.degree. C., an infra red spectrum (nujolmull) having sharp peaks at 3195 cm.sup.-1, 3100 cm.sup.-1, 2735 cm.sup.-1 and 2625 cm.sup.-1 and an x-ray powder diffraction pattern with specific peaks occurring at 2.theta.=12.3.degree. and 44.5.degree..
    Type: Grant
    Filed: December 12, 1988
    Date of Patent: January 8, 1991
    Assignee: John Wyeth and Brothers Limited
    Inventors: Gerald Bradley, Geoffrey P. R. Carr, Albert Opalko, Richard J. Yarwood