Patents by Inventor John E. Blackford

John E. Blackford 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).

  • Pipe couplings
    Patent number: 4422673
    Abstract: A pipe coupling includes a nut in which a collet, a back-up member and an anti-extrusion washer are retained by means of an axially split ring which is detachably engageable in a peripheral groove in the back-up member and engaged in a recess in the nut. The anti-extrusion washer has an extrusion press fitted into the member. This construction permits the various parts to be easily assembled into the nut without the risk of damaging the ring or the screw-threading in the nut.
    Type: Grant
    Filed: June 3, 1981
    Date of Patent: December 27, 1983
    Assignee: Lucas Industries Limited
    Inventors: John E. Blackford, John J. Kelly, Philip A. Baker