Patents by Inventor Ralf Liebler

Ralf Liebler 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).

  • Patent number: 4612358
    Abstract: UV absorbing compounds, susceptible to free-radical polymerization, of the formula ##STR1## wherein R is alkyl having from 4 to 12 carbon atoms of which not more than 6 are present in a linear chain, and in particular 2-(2'-hydroxy-3'-methacrylamidomethyl-5'-tert-octylphenyl)benzotriazole, and polymers thereof.
    Type: Grant
    Filed: October 16, 1985
    Date of Patent: September 16, 1986
    Assignee: Rohm GmbH
    Inventors: Siegmund Besecke, Ralf Liebler, Heinz-Juergen Hohage, Guenter Schroeder
  • Patent number: 4576870
    Abstract: A method for making multilayered synthetic resin bodies by the coextrusion of thermoplastic molding compounds wherein at least one of the layers in the extruded body is to be protected against UV light, which comprises extruding at least one layer from a thermoplastic molding compound that is formed entirely or predominantly of a copolymer formed between monomers comprising in their molecules groups or structures which, because of their characteristic absorption of ultraviolet light, provide protection against ultraviolet light, together with other, known, monomers.
    Type: Grant
    Filed: March 28, 1984
    Date of Patent: March 18, 1986
    Assignee: Rohm GmbH
    Inventors: Ralf Liebler, Siegmund Besecke, Manfred Munzer
  • Patent number: 4495322
    Abstract: What are disclosed are coating formulations of improved storage stability comprising a silicone resin prepared by the condensation of partially hydrolyzed organo-silicon compounds in the presence of an acid, said coating formulations containing an amide of an alkanoic acid having up to 22 carbon atoms or an amide of benzoic acid, optionally substituted, or a carbamic acid ester having an alkyl group containing up to 18 carbon atoms or having a phenyl or naphthyl group, optionally substituted, in the ester part, or containing ureas or lactams, or mixtures thereof.
    Type: Grant
    Filed: March 5, 1984
    Date of Patent: January 22, 1985
    Assignee: Rohm GmbH
    Inventor: Ralf Liebler
  • Patent number: 4455403
    Abstract: What are disclosed are coating formulations having improved storage stability comprising a silicone resin prepared by the condensation of partially hydrolyzed organosilane compounds in the presence of acids and further containing an alkanoic acid having from 6 to 21 carbon atoms.
    Type: Grant
    Filed: August 24, 1982
    Date of Patent: June 19, 1984
    Assignee: Rohm GmbH
    Inventor: Ralf Liebler