Patents by Inventor Leonardus A. van Der Heyden

Leonardus A. van Der Heyden 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 preparation of a coagulated material
    Patent number: 4886702
    Abstract: The invention relates to a process for the preparation of a coagulated material by impregnating a textile cloth in an impregnating bath containing at least a coagulable polymer latex followed by coagulation in a coagulating bath.The process of the invention is characterized in that the coagulation is carried out from the water phase, whereas the impregnating bath contains a (chemical or physical) foaming agent, wherein foaming occurs simultaneously with the coagulation or immediately thereafter.It is surprisingly found that according to the present process a high quality coagulated material is obtained, which is comparable with the coagulated material, obtained according to conventional processes.
    Type: Grant
    Filed: January 21, 1988
    Date of Patent: December 12, 1989
    Inventors: Dirk P. Spek, Leonardus A. van der Heyden
  • Coagulated materials
    Patent number: 4833173
    Abstract: The invention relates to a coagulable composition, to a process for the preparation of a coagulated material by impregnating a textile cloth in an impregnating bath containing the coagulable composition followed by coagulation in a coagulating bath and to the resulting coagulated material.The process of the invention is characterized in that the coagulation is carried out from the water phase, and the impregnating bath contains a chemical or physical foaming agent, wherein foaming occurs simultaneously with the coagulation or immediately thereafter.It is surprisingly found that according to the present invention a high quality coagulated material is obtained, having properties comparable with the coagulated material obtained according to conventional solvent based processes.
    Type: Grant
    Filed: July 22, 1988
    Date of Patent: May 23, 1989
    Inventors: Dirk P. Spek, Leonardus A. van Der Heyden