Patents by Inventor Bernie L. Chalmers

Bernie L. Chalmers 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).

  • Retrieval tool
    Patent number: 4580826
    Abstract: A retrieval tool to retrieve loose pipe and the like from a well. A bell-mouth centering device is sent down the hole to center the pipe, and a spear passes through the centering device into the pipe. Gripping devices carried by the spear engage the pipe so as to pull it to the surface. The gripping devices are able to cut a thread in the pipe so as to be releasable from the pipe if desired.
    Type: Grant
    Filed: February 17, 1984
    Date of Patent: April 8, 1986
    Inventors: Herman C. Carver, Michael R. Kent, Bernie L. Chalmers