Patents by Inventor Charles E. Marquis

Charles E. Marquis 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).

  • Inflatable mattress structure
    Patent number: 4962553
    Abstract: An inflatable mattress structure for an invalid's bed has separately inflatable transverse sections which can be releasably secured together to form the mattress. Additionally, each section is itself divided lengthwise into separately inflatable left- and right-hand portions. Thus, in the structure as a whole, the left and right sides of the mattress can be selectively inflated and deflated to position an occupant on one or other side.
    Type: Grant
    Filed: April 19, 1989
    Date of Patent: October 16, 1990
    Inventor: Charles E. Marquis