Patents by Inventor Garmt R. Meima

Garmt R. Meima 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).

  • Alkylation of aromatic compounds
    Patent number: 5243116
    Abstract: Alkylated benzenes such as ethylbenzene and cumene are produced by alkylation and/or transalkylation in the presence of an acidic mordenite zeolite catalyst having a silica/alumina molar ratio of at least 30:1 and a crystalline structure which is determined by X-ray diffraction to be a matrix of Cmcm symmetry having dispersed therein domains of Cmmm symmetry.
    Type: Grant
    Filed: December 22, 1989
    Date of Patent: September 7, 1993
    Assignee: The Dow Chemical Company
    Inventors: Guo-shuh J. Lee, Juan M. Garces, Garmt R. Meima, Matheus J. M. van der Aalst
  • Process of recovering monoalkylbenzene and pure 1,3,5-trialkylbenzene from a mixture of dialkyl- and trialkylbenzenes
    Patent number: 5202516
    Abstract: A process of recovering monoalkylbenzene and pure 1,3,5-trialkylbenzene from an isomeric mixture containing dialkyl- and trialkylbenzenes. The process comprises transalkylating a monocyclic aromatic compound with a mixture of dialkyl- and trialkyl-benzenes in the presence of an acidic mordenite zeolite under conditions such that monoalkylbenzene and predominantly 1,3,5-trialkylbenzene are formed. 1,3,5-trialkylbenzene is isolated in pure form from a mixture of the same and 1,2,4- and/or 1,2,3-trialkylbenzene by use of a dealuminated zeolite Y adsorbent.
    Type: Grant
    Filed: August 19, 1991
    Date of Patent: April 13, 1993
    Assignee: The Dow Chemical Company
    Inventors: Guo-shuh J. Lee, Michael M. Olken, Juan M. Garces, Garmt R. Meima
  • Alkylation of aromatic compounds
    Patent number: 5198595
    Abstract: Monoalkylated benzene such as ethylbenzene and cumene or monoalkylated substituted benzene are produced by alkylation in the presence of an acidic mordenite zeolite catalyst having a silica/alumina molar ratio of at least 40:1, preferably 160:1. In a subsequent, optional process, the polyalkylated benzene or polyalkylated substituted benzene produced in the alkylation is transalkylated in the presence of an acidic mordenite zeolite catalyst.
    Type: Grant
    Filed: June 21, 1991
    Date of Patent: March 30, 1993
    Assignee: The Dow Chemical Company
    Inventors: Guo-shuh J. Lee, Juan M. Garces, Garmt R. Meima, Matheus J. M. van der Aalst
  • Silver catalyst and a process for preparing same
    Patent number: 4786743
    Abstract: A supported silver catalyst having improved thermostability is prepared by depositing silver particles on a carrier or support having a stepped structure.
    Type: Grant
    Filed: October 31, 1986
    Date of Patent: November 22, 1988
    Assignee: The Dow Chemical Company
    Inventors: Jacobus E. Bongaarts, Garmt R. Meima, John W. Geus
  • Process for loading a carrier with a catalytically active material or with a precursor of a catalytically active material, and the catalyst produced by said process
    Patent number: 4783434
    Abstract: Active catalysts are prepared by (1) impregnating a carrier with a solution of a complex of an active composition or precursor thereof wherein the viscosity of the solution is not decreased upon heating or evaporation of the solvent, (2) removing the solvent and (3) decomposing the complex.
    Type: Grant
    Filed: October 31, 1986
    Date of Patent: November 8, 1988
    Assignee: The Dow Chemical Company
    Inventors: Johannes M. Wigman, John W. Geus, Jacobus E. Bongaarts, Garmt R. Meima