Granted Patent
Utility
US 4,243,107 · App. 06/006,136
Hydraulic hammer mounted on a movable boom
Inventor:
William Shook
Patented Case
View Patent ↗
Granted: Jan 6, 1981
Filed: Jan 24, 1979
Inventor
William Shook
Assignee (at issue)
Warner & Swasey
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.