Granted Patent
Utility
US 4,943,219 · App. 07/385,785
Hollow core concrete extruder
Inventor:
Richard C. Nash
Patented Case
View Patent ↗
Granted: Jul 24, 1990
Filed: Jul 27, 1989
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.