Patents by Inventor Andrew Clausen

Andrew Clausen 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 The Preparation Of Enantiomerically Enriched Beta Amino Acid Derivatives
    Publication number: 20080058522
    Abstract: The present invention relates to a process for the efficient preparation of enantiomerically enriched beta amino acid derivatives wherein the amino group is unprotected. The product chiral beta amino acid derivatives are useful in the asymmetric synthesis of biologically active molecules. The process comprises an enantioselective hydrogenation of an amine-unprotected prochiral beta-amino acrylic acid or derivative thereof in the presence of a rhodium metal precursor complexed with a chiral mono- or bisphosphine ligand.
    Type: Application
    Filed: April 5, 2005
    Publication date: March 6, 2008
    Inventors: Yi Xiao, Yongkui Sun, Thorsten Rosner, Nelo Rivera, Shane Krska, Andrew Clausen, Joseph Armstrong, Felix Spindler, Christophe Malan
  • Heat transfer element to replace electrical heating element
    Patent number: 4237969
    Abstract: A novel heat transfer element which permits simple, low-cost conversion of energy inefficient electrically heated water heaters to energy efficient potable-water storage tanks for storing water heated by energy-efficient gas-fired water heating systems.
    Type: Grant
    Filed: May 21, 1979
    Date of Patent: December 9, 1980
    Assignee: Southern California Gas Company
    Inventors: Willard E. Andre, Andrew Clausen, Jr., Ben B. Hultsman