Granted Patent
Utility
US 5,620,722 · App. 08/538,721
Extrusion head for blow molding
Inventor:
Dennis R. Spina
Patented Case
View Patent ↗
Granted: Apr 15, 1997
Filed: Oct 3, 1995
Inventor
Dennis R. Spina
Assignee (at issue)
Hoover Universal, 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.