Granted Patent
Utility
US 4,408,978 · App. 06/309,005
Advancement apparatus for concrete screed
Inventor:
Joe M. Owens
Patented Case
View Patent ↗
Granted: Oct 11, 1983
Filed: Oct 6, 1981
Inventor
Joe M. Owens
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.