Granted Patent
Utility
US 4,934,672 · App. 07/308,200
Locking cylinder hydraulic work support
Inventor:
Roger L. Craft
Patented Case
View Patent ↗
Granted: Jun 19, 1990
Filed: Feb 8, 1989
Inventor
Roger L. Craft
Assignee (at issue)
VEKTEK, INC.
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.