Patents by Inventor Detlef Hagena

Detlef Hagena 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).

  • Method for production of aryl alkyl ethers
    Patent number: 6624334
    Abstract: Aryl alkyl ethers can be produced by the reaction of hydroxyaromatics with an alcohol in the presence of a catalyst. This process achieves higher yields of aryl alkyl ethers and the formation of ring-alkylated products and dialkyl ethers is markedly reduced.
    Type: Grant
    Filed: April 8, 2002
    Date of Patent: September 23, 2003
    Assignees: Haarmann & Reimer GmbH, Bayer Aktiengesellschaft
    Inventors: Efim Biller, Edgar Fuhrmann, Detlef Hagena, Heinz Günter Janneck, Jörg Talbiersky, Lutz Walther
  • Stabilized lactic acid menthyl ester
    Patent number: 5783725
    Abstract: Lactic acid menthyl ester can be stabilized by addition of alkali metal carbonate and/or bicarbonate and/or alkaline earth metal carbonate and/or bicarbonate.
    Type: Grant
    Filed: February 13, 1997
    Date of Patent: July 21, 1998
    Assignee: Haarmann & Reimer GmbH
    Inventors: Walter Kuhn, Alfred Korber, Roland Langner, Detlef Hagena
  • Scents, and scent compositions containing them
    Patent number: 4814322
    Abstract: The invention relates to 1,2-dialkoxyalkenes of the formula ##STR1## in which R denotes an alkyl group having 1 to 3 carbon atoms, andn denotes an integer from 2 to 8 and to the use of 1,2-dialkoxyalkanes and -alkenes of the formula ##STR2## in which R denotes an alkyl group having 1 to 3 carbon atoms,n denotes an integer from 2 to 8, and ##STR3## denotes the CH.sub.3 --CH.sub.2 -- or CH.sub.2 50 CH-- group, as scents.
    Type: Grant
    Filed: March 23, 1988
    Date of Patent: March 21, 1989
    Assignee: Haarmann & Reimer GmbH
    Inventors: Fritz Exner, Detlef Hagena, Rudolf Hopp, Jurgen Nienhaus, Wilhelm Gottsch
  • 3-Methyl-aldehydes, processes for their preparation and their use as odorants
    Patent number: 4263459
    Abstract: The invention concerns new 3-methyl-aldehydes of the general formula ##STR1## wherein x is 6 or 7,a process for their preparation and their use as odorants.
    Type: Grant
    Filed: August 30, 1979
    Date of Patent: April 21, 1981
    Assignee: Haarmann & Reimer GmbH
    Inventors: Kurt Bauer, Detlef Hagena, Hans-Otto Muller
  • 3-Methyl-5-keto-.alpha.,.omega.-alkenedioic acids and esters
    Patent number: 4259518
    Abstract: The invention concerns new 3-methyl-5-keto-.alpha.,.omega.-alkene-dioic acids of the general formula ##STR1## wherein the double bond is in one of the positions indicated by the broken lines,R.sub.1 and R.sub.2 independently of one another are a hydrogen atom or a C.sub.1 -C.sub.4 -alkyl group,x is an integer from 9 to 11 andy and z independently of one another are 1 or 2, but cannot both be 1;a process for their preparation and their use for the preparation of macrocyclic .beta.-methyl ketones which are valuable fragrances.
    Type: Grant
    Filed: August 30, 1979
    Date of Patent: March 31, 1981
    Assignee: Bayer Aktiengesellschaft
    Inventors: Kurt Bauer, Detlef Hagena