Patents by Inventor Robert A. Wignall

Robert A. Wignall 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).

  • Humidifier pad
    Patent number: 4540530
    Abstract: A humidifier pad for use in humidifiers suitable for adding moisture to the air circulated by a forced air furnace is described together with its method of manufacture. A slab of open-cell foam is stamped using a reciprocating cutter to form humidifier pads which are seamless. These seamless pads are adapted to be fitted onto the cylindrical support frame of the humidifier and the pad is especially useful in a combination with a type of frame which is collapsible cylindrical and which facilitates removal and replacement of the pad.
    Type: Grant
    Filed: January 23, 1985
    Date of Patent: September 10, 1985
    Assignee: B. D. Wait Co. Limited
    Inventors: Robert A. Wignall, Samuel Travale