Patents by Inventor Raymond L. Thompson

Raymond L. Thompson 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).

  • Rotational casting mold
    Patent number: 4078761
    Abstract: A mold for rotational casting of plastics is disclosed. The mold is formed in two mating sections with one section having a raised tongue and the other having a groove disposed to receive the tongue. The mold sections have flat faces fitting together in sealing engagement. A channel is formed in one of the flat faces around the tongue, and aperture means are provided to communicate the channel with the outside of the mold. Also, additional aperture means are provided to connect the groove with the outside of the mold. Thus, entrapped gases are preferentially vented to the outside of the mold rather than inwardly where they could deform cast parts.
    Type: Grant
    Filed: September 20, 1976
    Date of Patent: March 14, 1978
    Inventor: Raymond L. Thompson