Patents by Inventor Franz Riemhofer

Franz Riemhofer 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 the manufacture of composite foam materials
    Patent number: 4315996
    Abstract: Method for manufacturing composite foam articles from foam material flakes, polyurethane binders and additional solid components which cause a modification or change of the properties of foam material by mixing and hardening the mixture under pressure. The additional solid components are admixed in the form of an aqueous dispersion and/or aqueous solution thereby introducing and admixing them without difficulty and permitting the manufacture of composite foam materials with different properties as required.
    Type: Grant
    Filed: December 4, 1980
    Date of Patent: February 16, 1982
    Assignee: Metzeler Schaum GmbH
    Inventors: Gunther Baatz, Klaus-Dieter Conrad, Franz Riemhofer
  • Catalyst mixture for use in trimerizing and/or polymerizing isocyanates and/or for the polyaddition of active hydrogen atom containing polyethers and polyisocyanates
    Patent number: 4080345
    Abstract: Catalyst mixture for use in trimerizing and/or polymerizing isocyanates and/or for the polyaddition of active hydrogen atom containing polyethers and polyisocyanates comprising an amine as conventionally used in polyurethane chemistry in combination with an alkali metal salt of an inorganic acid and the trimerization and/or polymerization and/or polyaddition reaction utilizing such catalyst mixture.
    Type: Grant
    Filed: March 3, 1976
    Date of Patent: March 21, 1978
    Assignee: Metzeler Schaum GmbH
    Inventor: Franz Riemhofer