Patents by Inventor Mark J. Sebastian

Mark J. Sebastian 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).

  • Supercritical separation of isomers of functional organic compounds at moderate conditions
    Patent number: 5196575
    Abstract: A method of separating isomers of functionalized aromatic compounds using solvent-modified supercritical carbon dioxide is disclosed and claimed. In one embodiment, isomers of hydroxynaphthoic acid are separated by selective extraction of the more soluble species.
    Type: Grant
    Filed: February 19, 1992
    Date of Patent: March 23, 1993
    Assignee: Hoechst Celanese Corp.
    Inventor: Mark J. Sebastian
  • Process for the production of esters exhibiting nonlinear optical response
    Patent number: 4997977
    Abstract: This invention provides multistep process embodiments for the production of novel esters which exhibit nonlinear optical response.A process embodiment is illustrated by the reaction of a Schiff base with a substituted acetic acid to form a stilbene alcohol intermediate: ##STR1## The stilbene alcohol intermediate is decarboxylated, and then is esterified in the presence of a pyridine type catalyst to provide an ester with a conjugated structure.
    Type: Grant
    Filed: September 11, 1989
    Date of Patent: March 5, 1991
    Assignee: Hoechst Celanese Corp.
    Inventors: Thomas M. Leslie, Bernice I. Feuer, Mark J. Sebastian
  • Lower-alkyl or aryl-sulfonyl unsaturated tacopherols
    Patent number: 4882441
    Abstract: A process for producing natural vitamin E and intermediates in this process.
    Type: Grant
    Filed: September 9, 1988
    Date of Patent: November 21, 1989
    Assignee: Hoffmann-La Roche Inc.
    Inventors: David L. Coffen, Rudolf Schmid, Mark J. Sebastian
  • Vitamin E intermediate
    Patent number: 4879395
    Abstract: A process for producing natural vitamin E and intermediates in this process.
    Type: Grant
    Filed: September 9, 1988
    Date of Patent: November 7, 1989
    Assignee: Hoffmann-La Roche Inc.
    Inventors: David L. Coffen, Rudolf Schmid, Mark J. Sebastian
  • Vitamin E intermediates
    Patent number: 4853472
    Abstract: A process for producing natural vitamin E and intermediates in this process.
    Type: Grant
    Filed: September 9, 1988
    Date of Patent: August 1, 1989
    Assignee: Hoffmann-La Roche Inc.
    Inventors: David L. Coffen, Rudolf Schmid, Mark J. Sebastian
  • 2-(trimethyl-tridecenyl)-tetramethylchroman intermediates for vitamin E
    Patent number: 4789750
    Abstract: 6-Etherified hydroxy -2-(4',8',12'-trimethyl-5'-tridecenyl)-2,5,7,8-tetramethylchromans with an oxo or hydroxy substituent at the 2' position which may be substituted with an arylsulfonyl or a carboxyalkyl at the 3' position and containing a single or double bond at the 11 position, said chromans being intermediates for producing natural vitamin E.
    Type: Grant
    Filed: March 27, 1987
    Date of Patent: December 6, 1988
    Assignee: Hoffman-La Roche Inc.
    Inventors: David L. Coffen, Rudolf Schmid, Mark J. Sebastian