Granted Patent
Utility
US 5,641,576 · App. 08/528,833
Buffered acid interleaving for glass sheets
Inventor:
Helmut Franz
Patented Case
View Patent ↗
Granted: Jun 24, 1997
Filed: Sep 15, 1995
Inventor
Helmut Franz
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.