Granted Patent
Utility
US 4,240,231 · App. 05/939,361
Rectilinear work finishing apparatus
Inventor:
Lawrence Day
Patented Case
View Patent ↗
Granted: Dec 23, 1980
Filed: Sep 5, 1978
Inventor
Lawrence Day
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.