Patents by Inventor Harold C. Hervig, Jr.

Harold C. Hervig, Jr. 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).

  • Mold useful in sealing leaks in pipes
    Patent number: 4326735
    Abstract: The present invention is directed to an article and processes for repairing fluid (e.g., liquid and gas) leaks in pipes, including, for example, bell and spigot joints.The device and process of the invention incorporates an elastomeric sleeve that extends around the pipe and longitudinally to either side of the leak. The sleeve contains a resin injection port with means to prevent escape of resin at a pressure above a predetermined pressure, and a fluid venting port with pressure-relief means to permit the escape of fluid at a predetermined pressure above the pressure in the pipe to be repaired.
    Type: Grant
    Filed: October 14, 1980
    Date of Patent: April 27, 1982
    Assignee: Minnesota Mining & Manufacturing Company
    Inventors: David N. Hunder, Harold C. Hervig, Jr.