Patents by Inventor Martin Neumeier

Martin Neumeier 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).

  • Process for the production of a molding from a preform composed essentially of polymerized units of tetrafluoroethylene
    Patent number: 4849153
    Abstract: A process for the production of a molding from at least one preform, in which process the preform, which has been heated to 330.degree. to 400.degree. C., is pressed by means of a pressure difference which increases slowly during the shaping into or onto a rigid mold heated to about the same temperature, and is then cooled while the pressure difference is maintained and is released from the mold. During the shaping and cooling, the edges of the preform are secured in their original position. The process makes it possible to produce moldings which have a thin wall thickness and a good surface and which exhibit a residual shrinkage which is sufficiently small for most applications.
    Type: Grant
    Filed: March 9, 1988
    Date of Patent: July 18, 1989
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Wolfgang Michel, Martin Neumeier