Patents by Inventor Donald L. Blassingame

Donald L. Blassingame 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).

  • Patent number: 4741679
    Abstract: A gas-lock eliminating traveling valve for a sucker rod operated oil pump includes a fluid outlet ported pump head connecting inner and outer sleeves with the upper end of a working barrel for reciprocating the latter. A valve is tethered within the inner sleeve in a manner insuring separation of the valve from its seat for opening the pump fluid passageway and exhausting gas from the pump bore with each complete sucker rod stroke.
    Type: Grant
    Filed: October 20, 1986
    Date of Patent: May 3, 1988
    Inventor: Donald L. Blassingame