Patents by Inventor Wilfred E. Willis

Wilfred E. Willis 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).

  • Fire-retardant polymer foam composites
    Patent number: 5137777
    Abstract: A fire retardant polymer foam composite suitable for the making of packaging material, including a thin film of fire-retardant plastic extruded between layers of polymer foam sheets and bonded together to form a composite sheet of material having a sandwich structure.
    Type: Grant
    Filed: December 11, 1990
    Date of Patent: August 11, 1992
    Assignee: Ametek
    Inventors: Lance D. Silverman, Warren F. Legg, Wilfred E. Willis
  • Variable thickness foam plank
    Patent number: 5066531
    Abstract: A process for hot pin perforation bonding of a plurality of lamina of thermoplastic foam sheet material to produce a controllably rigid, strong, lightweight and easily shaped cushioned foam plank; and a product as formed in that process.
    Type: Grant
    Filed: September 5, 1989
    Date of Patent: November 19, 1991
    Assignee: Ametek
    Inventors: Warren F. Legg, Wilfred E. Willis
  • Rotary pouring system
    Patent number: 4168739
    Abstract: A plurality of carriages, each containing a pouring ladle, are provided for pouring molten metal into moving molds of a conveyor. The carriages are essentially driven from a single motor and move in a closed loop containing a loading zone and a pouring zone. Each carriage contains a clutch pump and a brake pump to control movement along the loop. Rotation of ladles to a pour position is attained by use of a parallelogram linkage on the carriage and remotely located variable pour rate controls.
    Type: Grant
    Filed: December 20, 1977
    Date of Patent: September 25, 1979
    Assignee: Inductotherm Corp.
    Inventors: Frank B. Smith, Wilfred E. Willis
  • Accelerator for gypsum slurry
    Patent number: 4132565
    Abstract: An improved accelerator is produced by impact and ball mill grinding gypsum board so that gypsum particles have size of less than one micron in diameter, in the absence of an additive to inhibit calcination.
    Type: Grant
    Filed: October 31, 1977
    Date of Patent: January 2, 1979
    Assignee: Kaiser Cement & Gypsum Corporation
    Inventor: Wilfred E. Willis