Patents by Inventor Ulrich Eholzer

Ulrich Eholzer 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).

  • Rubber vulcanizates having improved hysteresis behavior
    Patent number: 5130363
    Abstract: The rubber vulcanizates according to the invention, which are produced using certain carboxyalkyl oligosulfides, are distinguished by improved hysteresis behavior; their mechanical properties remain substantially unaffected.
    Type: Grant
    Filed: November 18, 1991
    Date of Patent: July 14, 1992
    Assignee: Bayer Aktiengesellschaft
    Inventors: Thomas Scholl, Hans-Wilhelm Engels, Ulrich Eisele, Ulrich Eholzer
  • Vulcanization acceleration based on melamine derivatives, rubber compositions containing melamine derivatives, and a process for the vulcanization of rubber
    Patent number: 4369122
    Abstract: Vulcanization accelerators based on(a) melamine derivatives, optionally in combination with(b) conventional vulcanization accelerators taken from the group of thiazole accelerators, and optionally(c) other conventional accelerators, a rubber composition containing said accelerator and a process for vulcanizing rubber.
    Type: Grant
    Filed: February 17, 1981
    Date of Patent: January 18, 1983
    Assignee: Bayer Aktiengesellschaft
    Inventors: Rudiger Schubart, Ulrich Eholzer
  • Vulcanization system, rubber mixture containing said system and a process of vulcanization
    Patent number: 4340695
    Abstract: A vulcanization system consisting of(a) 20-50 parts by weight of sulphur or 20-50 parts by weight of a sulphur donor,(b) 20-50 parts by weight of an accelerator of the mercapto or sulphenamide group,(c) 0-10 parts by weight of a conventional accelerator additive, and(d) 20-50 parts by weight of a compound corresponding to the general formula (i): ##STR1## wherein R.sub.1 to R.sub.5 are identical or different and denote hydrogen, halogen, nitro, cyano, CF.sub.3, CCl.sub.3, carboxyl, an alkoxy group containing 1-4 C-atoms in the alkyl part, or a C.sub.1 -C.sub.4 alkyl group but the groups R.sub.1 -R.sub.5 must not all be hydrogen;x represents 1-4, preferably 2-3,y represents 0 or 1, andZ denotes divalent groups such as ##STR2## C.sub.1 -C.sub.12 alkylene, C.sub.4 -C.sub.12 cycloalkylene, C.sub.6 -C.sub.10 arylene or C.sub.8 -C.sub.12 arylalkylene, andR.sub.6 denotes the group corresponding to the formula: ##STR3## wherein R.sub.1 -R.sub.5 have the meaning indicated above and may all be hydrogen;C.sub.1 -C.sub.
    Type: Grant
    Filed: April 8, 1981
    Date of Patent: July 20, 1982
    Assignee: Bayer Aktiengesellschaft
    Inventors: Rudiger Schubart, Ulrich Eholzer, Theo Kempermann, Ernst Roos
  • Vulcanization system, a rubber mixture containing this vulcanization system and a vulcanization process
    Patent number: 4306992
    Abstract: A mixture comprising sulphur or a sulphur donor, a mercapto- or sulfenamide vulcanization accelerator, a compound containing a thiophenyl radical and a standard auxiliary accelerator is used as a vulcanization system for natural or synthetic rubber.
    Type: Grant
    Filed: May 5, 1980
    Date of Patent: December 22, 1981
    Assignee: Bayer Aktiengesellschaft
    Inventors: Rudiger Schubart, Ulrich Eholzer, Theo Kempermann, Ernst Roos
  • Process for the production of thiazoline-2-thiones
    Patent number: 4148800
    Abstract: One-pot process for producing thiazoline-2-thiones by reacting corresponding aminoethanols with thionylchloride, heating the resulting product and reacting it subsequently with carbon disulphide.
    Type: Grant
    Filed: January 5, 1978
    Date of Patent: April 10, 1979
    Assignee: Bayer Aktiengesellschaft
    Inventors: Rudiger Schubart, Ulrich Eholzer
  • Bis (2-benzthiazole-dithio)-N,N'-piperazines and their use as vulcanizing agents
    Patent number: 3975333
    Abstract: The invention relates to bis (2-benzthiazole-dithio)-N,N'-piperazines of the general formula (I) ##SPC1##a process of their production and the use as a vulcanizing agent for natural or synthetic rubber as well as a process for the vulcanization of a natural or synthetic rubber.
    Type: Grant
    Filed: December 9, 1974
    Date of Patent: August 17, 1976
    Assignee: Bayer Aktiengesellschaft
    Inventors: Rudiger Schubart, Ulrich Eholzer
  • Bis (2-benthiazole-dithio)-M,M'-piperazines and their use as vulcanizing agents
    Patent number: 3959284
    Abstract: The invention relates to bis (2-benzthiazole-dithio)-N,N'-piperazines of the general formula (I) ##SPC1##a process of their production and the use as a vulcanising agent for natural or synthetic rubber as well as a process for the vulcanisation of a natural or synthetic rubber.
    Type: Grant
    Filed: March 28, 1972
    Date of Patent: May 25, 1976
    Assignee: Bayer Aktiengesellschaft
    Inventors: Rudiger Schubart, Ulrich Eholzer