Patents by Inventor William Alfred Clark

William Alfred Clark 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).

  • Apparatus for formation of products from temporarily plastic materials
    Patent number: 4080135
    Abstract: A method of and machine for forming articles from a temporarily plastic material in which a hollow mould has material in a plastic state placed in it; plungers to form the interior surface of a through pipe operated to displace plastic material in that mould and a further hollow plunger operated to form a further outlet the passageway of which connects with the through passageway.
    Type: Grant
    Filed: September 9, 1976
    Date of Patent: March 21, 1978
    Inventor: William Alfred Clark