Granted Patent
Utility
US 5,649,990 · App. 08/527,912
Combination flexible/rigid ring mold
Inventors:
Robert G. Frank, Samuel E. Behanna, Rudolph A. Karlo, Jeffrey L. Marietti
Patented Case
View Patent ↗
Granted: Jul 22, 1997
Filed: Sep 14, 1995
Inventors
Robert G. Frank
Samuel E. Behanna
Rudolph A. Karlo
Jeffrey L. Marietti
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.