Patents by Inventor John Ernest Marjoram

John Ernest Marjoram 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).

  • Method for molding a block of polyurethane foam having a flat upper surface
    Patent number: 4088722
    Abstract: A method is provided to make substantially flat-topped blocks of plastics foam, e.g. polyurethane, by a batch process. The foam-forming reaction mixture is dispensed into a cavity defined by a support and shaping members for the sides of the block. As the foaming commences the support is lowered so that the zone of contact between the shaping members and the foam remains constant. By this means the dome-shaped effect of free-foaming is avoided.
    Type: Grant
    Filed: July 3, 1975
    Date of Patent: May 9, 1978
    Assignee: Dunlop Limited
    Inventor: John Ernest Marjoram