Patents by Inventor Stephen C. Rocke

Stephen C. Rocke 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).

  • Patent number: 5175135
    Abstract: Aromatic compounds, such as benzene or biphenyl, are alkylated with an alkylating agent having from one to eight carbons atoms, such as propylene, in the presence of an acidic mordenite zeolite catalyst under conditions sufficient to produce a mixture of substituted aromatic compounds enriched in the linear alkylated isomers, such as p-diisopropylbenzene or p,p'-di(isopropyl)biphenyl, respectively. The novel acidic mordenite catalyst is characterized by its silica/alumina molar ratio, its porosity, and a Symmetry Index. The p,p'-disubstituted isomers of aromatic compounds are useful as monomers in the preparation of thermotropic, liquid crystal polymers.
    Type: Grant
    Filed: April 22, 1991
    Date of Patent: December 29, 1992
    Assignee: The Dow Chemical Company
    Inventors: Guo-Shun J. Lee, Juan M. Garces, Joseph J. Maj, Stephen C. Rocke
  • Patent number: 5004841
    Abstract: Aromatic compounds, such as benzene or biphenyl, are alkylated with an alkylating agent having from one to eight carbons atoms, such as propylene, in the presence of an acidic mordenite zeolite catalyst under conditions sufficient to produce a mixture of substituted aromatic compounds enriched in the linear alkylated isomers, such as p-diisopropylbenzene or p,p'-di(isopropyl)biphenyl, respectively. The novel acidic mordenite catalyst is characterized by its silica/alumina molar ratio, its porosity, and a Symmetry Index. The p,p'-disubstituted isomers of aromatic compounds are useful as monomers in the preparation of thermotropic, liquid crystal polymers.
    Type: Grant
    Filed: March 14, 1989
    Date of Patent: April 2, 1991
    Assignee: The Dow Chemical Company
    Inventors: Guo-shuh J. Lee, Juan M. Garces, Joseph J. Maj, Stephen C. Rocke
  • Patent number: 4891448
    Abstract: Polycyclic aromatic compounds, such as biphenyl, are alkylated with an alkylating agent, such as propylene, in the presence of an acidic mordenite zeolite catalyst under conditions sufficient to produce a mixture of substituted polycyclic aromatic compounds enriched in the para alkylated isomers, such as p,p'-di(isopropyl)biphenyl. The novel acidic mordenite catalyst is characterized by its silica/alumina molar ratio, its porosity, and a Symmetry Index. The p,p'-disubstituted isomers of polycyclic aromatic compounds are useful as monomers in the preparation of thermotropic, liquid crystal polymers.
    Type: Grant
    Filed: November 23, 1987
    Date of Patent: January 2, 1990
    Assignee: The Dow Chemical Company
    Inventors: Juan Garces, Joseph J. Maj, G. John Lee, Stephen C. Rocke