Patents by Inventor James G. Christenson

James G. Christenson 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).

  • Hapten compositions
    Patent number: 4329281
    Abstract: Novel hapten compositions consisting of 4-[4-[2-(aminopropyl)]phenyl]butanoic acid and its N-methyl derivative are useful in preparing immunogens which can be respectively employed in the elicitation of antibodies selective to amphetamine and methamphetamine. These antibodies can be used as reagents in immunoassays for these two compounds.
    Type: Grant
    Filed: December 21, 1979
    Date of Patent: May 11, 1982
    Assignee: Hoffmann-La Roche Inc.
    Inventors: James G. Christenson, Benjamin Pecherer
  • N-[3-methyl-4-(2-methyl-4-oxo-3,4-dihydro-quinazolin-3-y l)phenyl]succinamic acid
    Patent number: 4182879
    Abstract: A sensitive radioimmunoassay for methaqualone and its major metabolites is described. Included within this disclosure is the preparation of novel methaqualone haptens, the preparation of antigens from such haptens by coupling to an immunogenic carrier material, the use of such antigens to elicit antibodies selective to methaqualone and its major metabolites and an improved radiolabelled derivative of a methaqualone analog used in the practice of said radioimmunoassay.
    Type: Grant
    Filed: July 5, 1977
    Date of Patent: January 8, 1980
    Assignee: Hoffmann-La Roche Inc.
    Inventor: James G. Christenson