Patents by Inventor Harold C. Hervig

Harold C. Hervig 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).

  • Multi-core cable connection for medium voltage cable
    Patent number: 4381424
    Abstract: A multi-core cable connection for medium voltage cables in which each core connection includes a pair of prefabricated permanently elastic stress control elements, each of which has a sleeve-like main body of insulating material and a conductive sleeve-like insert in the body, extending out of one end thereof and bridging the core insulation and the conductor connector.
    Type: Grant
    Filed: April 28, 1981
    Date of Patent: April 26, 1983
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Harold C. Hervig, Dieter Kehr, Raymond Krabs
  • Molded high voltage splice body
    Patent number: 4377547
    Abstract: A method for making a molded high voltage splice body by positioning a conductive elastomeric electrode on a mandrel, positioning an extruded conductive elastomeric sleeve over the elastomeric electrode, sealing the ends of the elastomeric sleeve, placing the mandrel with the electrode and sleeve on it into a mold, injecting a curable insulating compound between the electrode and the sleeve under pressure and curing the insulating compound.
    Type: Grant
    Filed: January 18, 1982
    Date of Patent: March 22, 1983
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: Harold C. Hervig
  • 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.
  • High voltage splice
    Patent number: 4241004
    Abstract: Insulative sheath for high voltage cable splices has inner semiconductive member with inwardly directed bosses for positioning the sheath radially of the cable and splice and for contacting the connector of the splice to suppress corona discharge.
    Type: Grant
    Filed: April 23, 1979
    Date of Patent: December 23, 1980
    Inventor: Harold C. Hervig
  • Insulative corona discharge suppressing sheath for high voltage cable splices
    Patent number: 4164620
    Abstract: Insulative sheath for high voltage cable splices has inner semiconductive member with inwardly directed bosses for positioning the sheath radially of the cable and splice and for contacting the connector of the splice to suppress corona discharge.
    Type: Grant
    Filed: September 7, 1978
    Date of Patent: August 14, 1979
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: Harold C. Hervig