Patents by Inventor Joseph Zdrok

Joseph Zdrok 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).

  • Face mask and retainer
    Patent number: 5794617
    Abstract: A retainer is provided for a face piece that has a generally triangular face shaped rim for forming a seal over user's face when the face piece is worn. The retainer is made from a stiff material and has a rim that conforms to the rim of the face piece, and is shaped to provide a loose frictional fit over the face piece. The retainer helps protect the face piece during shipping, storage, and when otherwise not in use, and can help correct minor deformation in a face piece.
    Type: Grant
    Filed: October 17, 1996
    Date of Patent: August 18, 1998
    Assignee: Louis M. Gerson Co., Inc.
    Inventors: Robert Brunell, Joseph Zdrok