Granted Patent
Utility
US 4,579,577 · App. 06/685,012
Vacuum press mold construction
Inventor:
George R. Claassen
Patented Case
View Patent ↗
Granted: Apr 1, 1986
Filed: Dec 21, 1984
Inventor
George R. Claassen
Assignee (at issue)
PPG Industries, 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.