Granted Patent
Utility
US 4,256,187 · App. 05/965,202
Impact tool with hydraulic cocking mechanism
Inventor:
Louis H. Barnard
Patented Case
View Patent ↗
Granted: Mar 17, 1981
Filed: Nov 30, 1978
Inventor
Louis H. Barnard
Assignee (at issue)
Hughes Tool Company LLC
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.