Patents by Inventor Hermann Lohwasser

Hermann Lohwasser 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).

  • Use of arylguanidinium xanthogenates as vulcanization accelerators and process for the production thereof
    Patent number: 6136987
    Abstract: This invention relates to the use of arylguanidinium xanthogenates as vulcanization accelerators, to a process for the production thereof and to the arylguanidinium xanthogenates.
    Type: Grant
    Filed: October 25, 1999
    Date of Patent: October 24, 2000
    Assignee: Rhein Chemie Rheinau GmbH
    Inventors: Thomas Fruh, Ludger Heiliger, Hermann Lohwasser
  • Dithiocarbamate salts and their use as vulcanization accelerators
    Patent number: 5670693
    Abstract: Salts of formula (III) ##STR1## wherein R.sup.1 represents CN or a C.sub.1 -C.sub.8 alkyl group, R.sub.2 a mononuclear C.sub.6 -C.sub.10 aryl group and R.sub.3 a C.sub.1 -C.sub.3 alkyl group or hydrogen; and of formula (IV) ##STR2## wherein R represents hydrogen or C.sub.1 -C.sub.3 alkyl, Aryl a C.sub.6 -C.sub.10 (substituted) phenyl group, and R', R" represent hydrogen and C.sub.1 -C.sub.4 alkyl or R'+R" together represent C.sub.4 alkylene anda process for their preparation by reaction of the thiocarbamate of a primary aliphatic amine, of a bis-amine or of cyanamide with a guanidine hydrohalide.
    Type: Grant
    Filed: July 12, 1996
    Date of Patent: September 23, 1997
    Assignee: Bayer AG
    Inventor: Hermann Lohwasser
  • Polyacrylonitrile filament yarns
    Patent number: 4140844
    Abstract: The invention relates to dry-spun polyacrylonitrile filament yarns having a tensile strength of at least 47 cN/tex and an individual filament denier of at most 1.5 dtex and preferably an overall denier of 20 to 145 tex as well as to a process for the production thereof by spinning, hot drawing and relaxing, wherein the spun filaments are drawn during spinning to such an extent that, after subsequent hot drawing in a ratio of from 1:6 to 1:10 and relaxation, the individual filaments have a denier of at most 1.6 dtex.
    Type: Grant
    Filed: December 14, 1977
    Date of Patent: February 20, 1979
    Assignee: Bayer Aktiengesellschaft
    Inventor: Hermann Lohwasser
  • Process for the production of bulk yarns
    Patent number: 4035884
    Abstract: The invention relates to a process for the production of bulk yarns from chemically different acrylonitrile polymers.
    Type: Grant
    Filed: April 21, 1975
    Date of Patent: July 19, 1977
    Assignee: Bayer Aktiengesellschaft
    Inventors: Hermann Lohwasser, Alfred Nogaj, Ulrich Reinehr
  • Process for the production of spontaneously crimping polyacrylonitrile composite fibres with improved crimp properties
    Patent number: 4013753
    Abstract: The invention relates to a process for the production of spontaneously crimping composite fibres of acrylonitrile polymers wherein the dry-spun-filaments which still contain solvent are stretched to at least three times their original length in a bath of hot water which contains from 12 to 30 % by weight of dimethyl formamide. The stretching operation may be carried out in one or two stages.
    Type: Grant
    Filed: September 30, 1974
    Date of Patent: March 22, 1977
    Assignee: Bayer Aktiengesellschaft
    Inventors: Hermann Lohwasser, Alfred Nagaj, Horst Wieden