Patents by Inventor Donald W. Harrington

Donald W. Harrington 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 and methods for forming lateral openings in main pipelines and restraining apparatus for main and lateral pipe joints
    Patent number: 6017064
    Abstract: In a piping system having a main pipe or fitting joined to a lateral pipe, a restraint body or sling extends about the fitting or main pipe and is secured at opposite ends to the lateral pipe. The lateral pipe, main pipe or fitting and restraint body are formed of plastic material. The restraint body includes a bend intermediate its ends for wrapping about the fitting or main pipe and has arcuate sections at its ends for solvent-welding to the lateral pipe. Any tendency toward separation of the lateral pipe and the main fitting or main pipe is resisted in tension by the restraint body and the joint is stress-relieved.
    Type: Grant
    Filed: May 7, 1998
    Date of Patent: January 25, 2000
    Inventor: Donald W. Harrington