Patents by Inventor Mervin Stewart

Mervin Stewart 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 preparing an inflatable pad for a face mask
    Patent number: 4347205
    Abstract: A method of preparing an inflatable pad for a face mask in which a former (3) is coated with a curable composition which is cured to provide an elastic air-impermeable sheath (4) of rubber or like polymer which does not adhere to the former, thereby defining an inflation chamber. The former comprises a sheet of flexible material, e.g. polymer foam and remains within the pad in use thereby avoiding the conventional operations of slitting the air-impermeable sheath, removing the former and resealing the air-impermeable sheath.
    Type: Grant
    Filed: March 19, 1980
    Date of Patent: August 31, 1982
    Assignee: Warne Surgical Products Limited
    Inventor: Mervin Stewart