Granted Patent
Utility
US 4,893,859 · App. 07/227,768
Concrete slab lifting clamp
Inventor:
Richard C. Nash
Patented Case
View Patent ↗
Granted: Jan 16, 1990
Filed: Aug 3, 1988
Inventor
Richard C. Nash
Assignee (at issue)
FABCON, 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.