Patents by Inventor Frederick D. Walker

Frederick D. Walker 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).

  • Respirator apparatus
    Patent number: 5836303
    Abstract: A respirator apparatus comprises a mask with a passage and a mesh material disposed across the passage. The mesh material is fused between two layers of the mask material in a molding process. The mask is made of a cross-linked polyethylene material that is flexible, resilient, impervious to liquids, and a good insulator. The cross-linked polyethylene material may be formed to fit the individual facial contours of the wearer, and has a memory. A lip is disposed across the top of the mask, and provides a seal, preventing moist air from escaping that may fog the goggles or the glasses of the wearer.
    Type: Grant
    Filed: September 17, 1996
    Date of Patent: November 17, 1998
    Assignee: Thermal Air Products, Inc.
    Inventors: Wendell Hurst, William J. Nielsen, Robert C. Metzger, Frederick D. Walker