Patents by Inventor Johnnie C. Welch, Jr.

Johnnie C. Welch, 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).

  • Excavation machine with constant power output control for torque-converter driven working element
    Patent number: 7553258
    Abstract: A controller for crawlers of a trencher receives an indication of the speed of an engine and the speed of an output of a torque converter coupling the engine to an excavating element for digging a trench. Based on the ratio of the speed of the engine and the speed of the output of the torque converter, the controller overrides operator input on the crawlers and stops or slows the trencher when the ratio exceeds a predetermined ranged.
    Type: Grant
    Filed: October 17, 2006
    Date of Patent: June 30, 2009
    Assignee: Tesmec USA, Inc.
    Inventor: Johnnie C. Welch, Jr.
  • Trencher with foldable rock saw wheel
    Patent number: 6547337
    Abstract: A trencher with a rock saw wheel has a foldable section that may be pivoted to one side during transport of the trencher on a truck or trailer, in order to decrease the overall height of the trencher during transport, or can be removed to reduce transport weight.
    Type: Grant
    Filed: August 29, 2001
    Date of Patent: April 15, 2003
    Assignee: Tesmec USA, Inc.
    Inventor: Johnnie C. Welch, Jr.