Patents by Inventor Achim Heyer

Achim Heyer 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).

  • Non-wovens of electret fiber mixtures having an improved charge stability
    Patent number: 5726107
    Abstract: A non-wovens fabric of electret fibers having an improved charge stability and comprising materials which chiefly comprise a fiber-forming addition or condensation polymer and 0.01 to 30% by weight (preferably 0.01 to 10, in particular 0.1 to 5, % by weight), based on the weight of the material, of organic or organometallic charge control agents, wherein the non-woven fabric comprises at least two types of electret fiber which are made of different materials which differ from one another in that they comprise different fiber-forming addition or condensation polymers and if appropriate also different charge control agents is described.
    Type: Grant
    Filed: August 28, 1995
    Date of Patent: March 10, 1998
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Jorg Dahringer, Ernst-August Albers, Werner Groh, Achim Heyer