Patents by Inventor Ronnie R. Crenshaw

Ronnie R. Crenshaw 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).

  • Cyanocarboxamidines and quinazoline process
    Patent number: 4138561
    Abstract: Novel cyanocarboxamidines are disclosed. The new cyanocarboxamidines are particularly valuable as intermediates in the preparation of antihypertensive 4-amino-2-(4-substituted-piperazin-1-yl)-quinazolines.
    Type: Grant
    Filed: September 30, 1977
    Date of Patent: February 6, 1979
    Assignee: Bristol-Myers Company
    Inventors: Ronnie R. Crenshaw, George M. Luke, Richard A. Partyka
  • 1,2,3-Thiadiazole amides
    Patent number: 4101548
    Abstract: A series of novel 4-amino-2-(thiadiazole-carbonyl piperazinyl)-6,7-dimethoxyquinazolines is disclosed having antihypertensive properties. The thiadiazole substituent may be optionally substituted with alkyl or lower alkoxy carbonylamino groups. A representative embodiment of the invention is 4-amino-6,7-dimethoxy-2-[4-(5-ethoxy-carbonylamino-1,2,3-thiadiazole-4-car bonyl)-piperazin-1-yl]-quinazoline.
    Type: Grant
    Filed: February 22, 1977
    Date of Patent: July 18, 1978
    Assignee: Bristol-Myers Company
    Inventors: Ronnie R. Crenshaw, Richard A. Partyka