Patents by Inventor Hans-Jurgen Merkle

Hans-Jurgen Merkle 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: 3998923
    Abstract: A method and a device for making objects from plastics, wherein a plastic present in the moulding cavity is made to set while pressure is maintained, said moulding pressure being made to act on the plastic being moulded by means of the inflation of one or more fully or partly flexible and expansible moulding tools.The invention relates to a method of making objects from plastics by means of compression moulding, a plastic present in the cavity of a mould being made to set while a moulding pressure is maintained, and also to a device for performing this method.Plastics can be moulded in any given manner while in the plastic condition. For example, the plastic can be introduced into a hollow mould for this purpose. While the plastic material, particularly thermoplastic material is setting, sunk spots may form on the surfaces and pockets may arise inside the plastic as a result of shrinkage, especially when the object being moulded has relatively thick walls.
    Type: Grant
    Filed: May 28, 1974
    Date of Patent: December 21, 1976
    Inventor: Hans-Jurgen Merkle