Patents Assigned to W. R. Grace Australia Limited
  • Process for thermoforming thermoplastic sheet materials
    Patent number: 4595554
    Abstract: The present invention relates to an improved plug or tool for use in the production of shaped articles from thermoplastic sheet materials. An important feature of the present invention is that the tool or plug comprises a body portion which incorporates one or more inserts which possess a thermal conductivity different from the thermal conductivity of the body portion.
    Type: Grant
    Filed: November 7, 1984
    Date of Patent: June 17, 1986
    Assignee: W. R. Grace Australia Limited
    Inventors: Lance W. Bullock, Josip Vlahek, Ferenc Kovacs
  • Apparatus for thermoforming thermoplastic sheet materials
    Patent number: 4500277
    Abstract: The present invention relates to an improved plug or tool for use in the production of shaped articles from thermoplastic sheet materials. An important feature of the present invention is that the tool or plug comprises a body portion which incorporates one or more inserts which possess a thermal conductivity different from the thermal conductivity of the body portion.
    Type: Grant
    Filed: January 4, 1983
    Date of Patent: February 19, 1985
    Assignee: W. R. Grace Australia Limited
    Inventors: Lance W. Bullock, Josip Vlahek, Ferenc Kovacs