Granted Patent
Utility
US 4,473,516 · App. 06/454,942
Method and apparatus for injection molding plastic articles having solid exterior surfaces and porous interior cores
Inventor:
Edward C. Hunerberg
Patented Case
View Patent ↗
Granted: Sep 25, 1984
Filed: Jan 3, 1983
Inventor
Edward C. Hunerberg
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.