Patents by Inventor Arthur Wegmann

Arthur Wegmann 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 the preparation of phenyl alkyl ketones and benzaldehydes
    Patent number: 6211413
    Abstract: There is provided a process for the preparation of compounds of formula I wherein: X is H or F, Y is CF3 or F and R1 is hydrogen or C1-C2alkyl; in which process (1) a compound of formula II, wherein X and Y are as defined for formula I, is reacted with an organic or inorganic nitrite or nitrous acid; (2) the resulting diazonium compound of formula III is reacted with an aldoxime of formula V R1—CH═NOH   (V) wherein R1 is as defined for formula I, in presence of CuSO4; and (3) the resulting oxime of formula IV is hydrolyzed with aqueous acid to the compound of formula I.
    Type: Grant
    Filed: January 12, 1999
    Date of Patent: April 3, 2001
    Assignee: Bayer Aktiengesellschaft
    Inventors: Arthur Wegmann, Terry Lee Moore, Linhua Wang
  • Process for the preparation of 1,2-benzisothiazoles
    Patent number: 5527917
    Abstract: A process for the preparation of 1,2-benzisothiazoles of formula I ##STR1## wherein X is in any one of the 4 possible positions of the benzene ring and is hydrogen, halogen, nitro, C.sub.1 -C.sub.4 alkoxy, halo-C.sub.1 -C.sub.4 alkoxy, C.sub.2 -C.sub.4 alkenyloxy or C.sub.2 -C.sub.4 alkynyloxy, in which process a compound of formula II ##STR2## wherein X is as defined for formula I and R.sub.1 is hydrogen or an unsubstituted or substituted C.sub.1 -C.sub.12 hydrocarbon radical, is reacted in the presence of a catalytic amount of a strong acid.Compounds of formula I are known as pesticides, especially as nematicides.
    Type: Grant
    Filed: September 7, 1994
    Date of Patent: June 18, 1996
    Assignee: Ciba-Geigy Corporation
    Inventors: Hans-Ruedi Kanel, Arthur Wegmann, Denis Neff