Patents by Inventor Claude Furbringer

Claude Furbringer 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: 5886196
    Abstract: Hydrogen bis(oxalato)borate of the formula ##STR1## is used as a protonic acid catalyst in condensation reactions, such as Friedel-Crafts condensations, vinyl ether condensations of acetals with vinyl or propenyl ethers and acylations of phenols. The products of such condensations are, for example, dihydro-vitamin K.sub.1 monobenzoate, d,l-.alpha.-tocopherol, various intermediates in the synthesis of carotenoids as well as d,l-.alpha.-tocopherol acetate. As a result of the use in accordance with the invention of hydrogen bis(oxalato)borate various disadvantages associated with the use of other protonic acid catalysts, e.g. problems with corrosion, toxicity and environmental contamination, are avoided. The novel catalyst has advantages with respect to selectivity, yields, amounts required as well as working up after completion of the respective condensation.
    Type: Grant
    Filed: December 18, 1996
    Date of Patent: March 23, 1999
    Assignee: Roche Vitamins Inc.
    Inventor: Claude Furbringer
  • Patent number: 5030739
    Abstract: The invention is directed to a process for the catalytic oxidation of an isoprenoid containing at least one allylic hydrogen atom, which process comprises reacting the isoprenoid with oxygen or an oxygen-containing gas in an inert solvent in the presence of a N-hydroxydicarboxylic acid imide of the formula ##STR1## wherein A-B stands for CH.sub.2 -CH.sub.2, CH.dbd.CH, an aromatic hydrocarbon residue or a group derived from one of these groups in which one or more hydrogen atoms is/are replaced by alkyl or halogen,to produce a primary of secondary hydroperoxide.The process of the invention is suitable for the manufacture of steroids, vitamins, odorant substances, carotinoids and the like.
    Type: Grant
    Filed: August 31, 1990
    Date of Patent: July 9, 1991
    Assignee: Hoffman-La Roche Inc.
    Inventors: Joseph Foricher, Claude Furbringer, Karlheinz Pfoertner
  • Patent number: 4964929
    Abstract: A degradation product of ascorbic acid or isoascorbic acid obtained by heating the acid at a temperature between about C. and about C. until partial or complete decomposition of the acid occurs, useful in admixture with various nitrate-containing oxidation agents as an explosive and propellant material for a wide range of specific applications.
    Type: Grant
    Filed: August 17, 1989
    Date of Patent: October 23, 1990
    Assignee: Hoffmann-La Roche Inc.
    Inventors: Paul Beyeler, Claude Furbringer
  • Patent number: 4881993
    Abstract: The carbonyl compounds 5,6-carbonyl-ascorbic acid and 5,6-carbonyl-erythorbic acid been found useful for the preparation of explosive and propellant materials by admixing them with nitrate-containing oxidation agents and optionally further ingredients.
    Type: Grant
    Filed: June 29, 1989
    Date of Patent: November 21, 1989
    Assignee: Hoffman-LA Roche Inc.
    Inventors: Claude Furbringer, Horst Pauling