Granted Patent
Utility
US 4,371,330 · App. 06/189,262
Adjustable screed bar apparatus
Inventor:
Peter Heffernan
Patented Case
View Patent ↗
Granted: Feb 1, 1983
Filed: Sep 22, 1980
Inventor
Peter Heffernan
Assignee (at issue)
W. R. Grace & Co.
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.