Patents Assigned to Lawson Mardon Plastics
  • Method and apparatus for the manufacture of duckbill valves
    Patent number: 5897828
    Abstract: A method and apparatus for manufacture of duckbill valves in which the opposed lips of the valve are split by applying a high fluid pressure inside the valve. This pressure causes the valve to balloon and burst. Preferably, the valve is supported over all of its outer surface except the end to be split by a die. The system is particularly suited to duckbill valves made of thermoplastic elastomer.
    Type: Grant
    Filed: May 14, 1997
    Date of Patent: April 27, 1999
    Assignees: Whitbread, PLC, Heinekin Technical Services, B.V., Lawson Mardon Plastics
    Inventors: Mark Erich Sillince, Erwin Anton Rosens, Karl Mondszein