Patents by Inventor Orin Tempkin

Orin Tempkin 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 for preparing 1,4,8,11-tetraazacyclotetradecane
    Patent number: 5811544
    Abstract: An improved process for preparing 1,4,8,11-tetraazacyclotetradecane comprising the bisacylation of an acyclic diamine to obtain a dichlorodiamide compound in a first step, the cyclization of said diamide compound to obtain dioxocyclam in a second step, and the reduction of dioxocyclam in a third step to obtain the desired 1,4,8,11-tetraazacyclotetradecane.
    Type: Grant
    Filed: July 30, 1996
    Date of Patent: September 22, 1998
    Assignee: Johnson Matthey PLC
    Inventors: Orin Tempkin, Prasad Kapa