Patents by Inventor George Kvakovszky

George Kvakovszky 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 salts of 4-hydroxystyrene
    Patent number: 5304690
    Abstract: 4-Acetoxystyrene is reacted with a base in a solvent to form a salt of 4-hydroxystyrene via saponification. Alternatively, 4-hydroxystyrene is reacted with a base to form a salt of 4-hydroxystyrene. In the latter case, the 4-hydroxystyrene is prepared by the transesterification of 4-acetoxystyrene. Subsequently or simultaneously, the salt of 4-hydroxystyrene is reacted, preferably in situ, with di-tertiary-butyl-dicarbonate to form 4-tertiarybutoxycarbonyloxystyrene.
    Type: Grant
    Filed: June 22, 1993
    Date of Patent: April 19, 1994
    Assignee: Hoechst Celanese Corporation
    Inventors: George Kvakovszky, James H. Rea, Michael I. Sheehan, Brad L. Smith
  • Process for the preparation of substituted styrenes
    Patent number: 5247124
    Abstract: A process for preparing a substituted styrene by reacting a bisarylalkyl ether in the presence of an acid catalyst is disclosed. The process is preferably used for the preparation of 4-acetoxystyrene from 4,4'-(oxydiethylidene)bisphenol diacetate and 4-methoxystyrene from 4,4'-(oxydiethylidene)bisphenol dimethyl ether. A process for preparing a bisarylalkyl ether by reacting a corresponding arylalkanol in the presence of an acid catalyst is also disclosed.
    Type: Grant
    Filed: August 25, 1992
    Date of Patent: September 21, 1993
    Assignee: Hoechst Celanese Corporation
    Inventors: Mohammad Aslam, Brad L. Smith, George Kvakovszky
  • Method for preparing a salt of 4-hydroxystyrene and for preparing 4-tertiary-butoxycarbonyloxystyrene therefrom
    Patent number: 5241098
    Abstract: The present invention pertains to a method of forming a salt of 4-hydroxystyrene by reacting 4-acetoxystyrene with a suitable base in a suitable solvent system. Subsequently, or simultaneously, the salt of 4-hydroxystyrene can be reacted, preferably in situ, with di-tertiary-butyl-dicarbonate to form 4-tertiary-butoxycarbonyloxystyrene.
    Type: Grant
    Filed: November 16, 1990
    Date of Patent: August 31, 1993
    Assignee: Hoechst Celanese Corporation
    Inventors: George Kvakovszky, James H. Rea, Michael T. Sheehan, Brad L. Smith
  • Process for the preparation of bisarylalkyl ethers
    Patent number: 5210278
    Abstract: A process for preparing a substituted styrene by reacting a bisarylalkyl ether in the presence of an acid catalyst is disclosed. The process is preferably used for the preparation of 4-acetoxystyrene from 4,4'-(oxydiethylidene)bisphenol diacetate and 4-methoxystyrene from 4,4'-(oxydiethylidene)bisphenol dimethyl ether. A process for preparing a bisarylalkyl ether by reacting a corresponding arylalkanol in the presence of an acid catalyst is also disclosed.
    Type: Grant
    Filed: August 25, 1992
    Date of Patent: May 11, 1993
    Assignee: Hoechst Celanese Corporation
    Inventors: Mohammad Aslam, Brad L. Smith, George Kvakovszky
  • Process for the preparation of substituted styrenes
    Patent number: 5194672
    Abstract: A process for preparing a substituted styrene by reacting a bisarylalkyl ether in the presence of an acid catalyst is disclosed. The process is preferably used for the preparation of 4-acetoxystyrene from 4,4'-(oxydiethylidene)bisphenol diacetate and 4-methoxystyrene from 4,4'-(oxydiethylidene)bisphenol dimethyl ether. A process for preparing a bisarylalkyl ether by reacting a corresponding arylalkanol in the presence of an acid catalyst is also disclosed.
    Type: Grant
    Filed: May 14, 1991
    Date of Patent: March 16, 1993
    Assignee: Hoechst Celanese Corporation
    Inventors: Mohammad Aslam, Brad L. Smith, George Kvakovszky
  • Inhibition of calcium phosphate scale formation with a maleate polymer
    Patent number: 4673508
    Abstract: Maleate polymers and derivatives of maleate polymers containing specified functional groups are effective scale inhibitors, for calcium phosphate scale.
    Type: Grant
    Filed: November 13, 1985
    Date of Patent: June 16, 1987
    Assignee: Monsanto Company
    Inventors: James P. Coleman, George Kvakovszky, David J. Sikora