Patents by Inventor Henri M. Hoffmann

Henri M. Hoffmann 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 obtaining mixtures of isomeric acyloctahydronaphthalenes
    Patent number: 6160182
    Abstract: Acid catalyzed cyclization of Diels-Alder adducts of myrcene is performed in the presence of hydroxyl-containing compounds, giving the resulting mixtures of isomeric acyloctahydronaphthalenes enhanced quantities of isomers that are particularly useful in perfumery because of their woody-amber odors with enhanced amber note.
    Type: Grant
    Filed: August 19, 1998
    Date of Patent: December 12, 2000
    Assignee: Millennium Specialty Chemicals
    Inventors: Mark B. Erman, Carlos G. Cardenas, Henri M. Hoffmann
  • Cycloheptenols and their derivatives, methods of making thereof, and utilization thereof as fragrances
    Patent number: 5892104
    Abstract: This invention relates to a compound having the formula I: ##STR1## wherein n is an integer of from 0 to 1; when n is 1, one of dashed lines a and b is a single bond and the other of dashed lines a and b is a double bond, dashed line c is not present, and dashed line d is a single bond; when n is 0, dashed lines a, b, c and d are single bonds or one of dashed lines a and b is a single bond and the other of dashed lines a and b is a double bond, dashed line c is not present, and dashed line d is a double bond; R.sub.1, R.sub.2 and R.sub.3 are, independently, lower branched or straight chain alkyl, alkenyl or alkynyl of C.sub.1 -C.sub.6 ; and R.sub.4 is hydrogen, lower branched or straight chain alkyl, alkenyl or alkynyl of C.sub.1 -C.sub.5, or C(O)R.sub.5, wherein R.sub.5 is hydrogen or lower branched or straight chain alkyl, alkenyl or alkynyl of C.sub.1 -C.sub.4 ; wherein the sum of the carbon atoms in R.sub.1, R.sub.2, R.sub.3 and R.sub.4 is less than or equal to eight carbon atoms.
    Type: Grant
    Filed: February 14, 1997
    Date of Patent: April 6, 1999
    Assignee: Millenium Specialty Chemicals, Inc.
    Inventors: Bernard J. Kane, Henri M. Hoffmann