Patents by Inventor Hans U. Gonzenbach

Hans U. Gonzenbach 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).

  • Acetals and ketals of oxo-tetralins and oxo-indanes
    Patent number: 5084440
    Abstract: Novel odorants, namely acetals and ketals of alkyl-substituted oxo-tetralins and oxo-indanes, are described.
    Type: Grant
    Filed: January 24, 1990
    Date of Patent: January 28, 1992
    Assignee: Givaudan Corporation
    Inventors: Josianne Baudin, Alain-Pierre Bonenfant, Hans U. Gonzenbach
  • Selective chlorination of para-tertiary-butytoluene
    Patent number: 4853489
    Abstract: A novel process for the selective chlorination of p-tert-butyltoluene to p-tert-butylbenzyl chloride.
    Type: Grant
    Filed: May 28, 1983
    Date of Patent: August 1, 1989
    Inventor: Hans U. Gonzenbach
  • Process for the manufacture of benzene derivatives
    Patent number: 4804776
    Abstract: A novel process for the manufacture of p-tert.butylbenzene derivatives is described.The process comprises reacting p-tert.butyl-benzyl chloride with a 2-formylpropionate of the formula ##STR1## wherein R represents lower-alkyl, e.g. C.sub.1-6 -alkyl, especially methyl or ethyl,and, if desired, converting the resulting compound of theformula ##STR2## wherein R has the above significance, optionally after purification, into p-tert.butyl-.alpha.-methyl-hydrocinnamaldehyde by decarbalkoxylation.
    Type: Grant
    Filed: July 24, 1986
    Date of Patent: February 14, 1989
    Assignee: Givaudan Corporation
    Inventors: Josianne Baudin, Hans U. Gonzenbach
  • Process for treating 2-ethylhexyl p-methoxycinnamate in the presence of a phenol
    Patent number: 4713473
    Abstract: A process for treating 2-ethylhexyl p-methoxycinnamic acid ester is described. The process comprises heating, preferably distilling, the ester in the presence of a phenol to insure that the ester is considered Ames negative.
    Type: Grant
    Filed: January 8, 1987
    Date of Patent: December 15, 1987
    Assignee: Givaudan Corporation
    Inventors: Peter Schudel, Rolf Schwarzenbach, Hans U. Gonzenbach
  • Odorant and/or flavorant substances
    Patent number: 4481133
    Abstract: This invention discloses novel odorant and/or flavoring compositions containing a substituted tetralin or indan of the general formula ##STR1## wherein R' represents --CN, --COOH.sub.2 R.sup.6 or --COOCH.sub.2 R.sup.8 ; R.sup.2 through R.sup.8 represents hydrogen or methyl and n represents 1 or 2.The invention is also concerned with those novel tetralins and indans disclosed herein.
    Type: Grant
    Filed: January 10, 1983
    Date of Patent: November 6, 1984
    Assignee: Givaudan Corporation
    Inventors: Hans U. Gonzenbach, Paul A. Ochsner
  • Odorant substances
    Patent number: 4457862
    Abstract: New odoriferous compounds, particularly the compounds having the following formula: ##STR1## wherein R is an aliphatic residue having the formula ##STR2## wherein R.sup.1 is a C.sub.1-4 alkyl, C.sub.1-4 alkylidene or C.sub.2-4 alkenyl, the sum of the carbon atoms being in those residues from 2 to 5, m and n being equal to zero or 1, p being 1, 2 or 3 and the dotted lines representing one or two optional double bonds. The invention also relates to a method for the preparation of new di-ketones I: as well as the use of I as odoriferous compounds in odoriferous compositions, which are characterized by a certain proportion of compounds having the formula I.
    Type: Grant
    Filed: November 9, 1982
    Date of Patent: July 3, 1984
    Assignee: Givaudan Corporation
    Inventors: Josiane Baudin, Hans U. Gonzenbach
  • Odorant and/or flavorant substances
    Patent number: 4406828
    Abstract: This invention discloses novel odorant and/or flavoring compositions containing a substituted tetralin or indan of the general formula ##STR1## wherein R' represents --CN, --COCH.sub.2 R.sup.6 or --COOCH.sub.2 R.sup.8 ; R.sup.2 through R.sup.8 represent hydrogen or methyl and n represents 1 or 2.The invention is also concerned with those novel tetralins and indans disclosed herein.
    Type: Grant
    Filed: August 6, 1980
    Date of Patent: September 27, 1983
    Assignee: Givaudan Corporation
    Inventors: Hans U. Gonzenbach, Paul A. Ochsner