Patents by Inventor Wolfgang Cohnen

Wolfgang Cohnen 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).

  • Blowing agent mixture
    Patent number: 4065401
    Abstract: The invention refers to a blowing agent composition consisting of 1,4 butan-diol-bis-(carbonic acid ester-benzoic acid anhydride) and silicon dioxide. Silicon dioxide reduces the decomposition temperature of the anhydride while at the same time increasing the yield of gas substantially.
    Type: Grant
    Filed: August 22, 1975
    Date of Patent: December 27, 1977
    Assignee: Bayer Aktiengesellschaft
    Inventors: Wolfgang Cohnen, Gerhard Apel
  • Polymers and copolymers based on alkenoyl-oxybenzylidene-malonic esters as UV-absorbers and polymers stabilized therewith
    Patent number: 3943094
    Abstract: Homopolymers and copolymers based on alkenoyloxybenzylidene-malonic esters of the formula ##SPC1##WhereR.sup.1 is hydrogen or C.sub.1 to C.sub.4 -alkyl;R.sup.2 is C.sub.1 to C.sub.12 -alkyl or cycloalkyl andR.sup.3 is hydrogen, C.sub.1 to C.sub.8 -alkyl, C.sub.1 to C.sub.8 -alkoxy or halogen, and plastics, i.e., polycarbonates, stabilized therewith.
    Type: Grant
    Filed: January 10, 1975
    Date of Patent: March 9, 1976
    Assignee: Bayer Aktiengesellschaft
    Inventors: Dieter Margotte, Burkhard Lachmann, Hugo Vernaleken, Hans Rudolph, Wolfgang Cohnen