Patents by Inventor Alan S. Rothenberg

Alan S. Rothenberg 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).

  • Preparation of 2-vinylimidazoles by dehydrogenation of 2-ethylimidazoles and 2-ethylimidazolines
    Patent number: 4410706
    Abstract: A method for preparing 2-alkenylimidazoles from readily available 2-alkylimidazoles or 2-alkylimidazolines by dehydrogenating the 2-alkylimidazole or 2-alkylimidazoline in the presence of a suitable dehydrogenation catalyst. The preferred method provides 2-vinylimidazole by dehydrogenating 2-ethylimidazole or 2-ethylimidazoline. The reaction is advantageously carried out in a vapor phase in the presence of an inert carrier gas using as preferred dehydrogenation catalysts, copper chromites and catalysts comprising one or more of the metals molybdenum, iron, cobalt, zinc or chromium on non-reducible oxide supports such as alumina or silica.
    Type: Grant
    Filed: May 19, 1982
    Date of Patent: October 18, 1983
    Assignee: American Cyanamid Company
    Inventors: Alan S. Rothenberg, Hans P. Panzer, Joseph L. Schmitt, Roger J. Card
  • Homopolymers and copolymers of 2-alkenylimidazole or its 1,3-dialkyl-2-alkenylimidazolium salts
    Patent number: 4299939
    Abstract: 2-Alkenylimidazoles or the corresponding 1,3-dialkyl-2-alkenylimidazolium salts are homo- or copolymerized employing free radical catalysts.
    Type: Grant
    Filed: June 30, 1980
    Date of Patent: November 10, 1981
    Assignee: American Cyanamid Company
    Inventors: Hans P. Panzer, Alan S. Rothenberg, Paul F. Cutrufello
  • Preparation of N-substituted acrylamide monomers having cationic substituents
    Patent number: 4267372
    Abstract: Reaction of a beta-aminopropionamide with an acrylic acid or its derivative provides an N-substituted acrylamide monomer having cationic substituents attached thereto. The instant reaction occurs under mild processing conditions at a temperature between about 160.degree. C. and 230.degree. C.
    Type: Grant
    Filed: October 26, 1979
    Date of Patent: May 12, 1981
    Assignee: American Cyanamid Company
    Inventors: Alan S. Rothenberg, Michael N. Desmond