Granted Patent
Utility
US 4,399,598 · App. 06/241,429
Ceramic rolls with metal end caps
Inventors:
Joseph V. Page, Henry P. Hanneken
Patented Case
View Patent ↗
Granted: Aug 23, 1983
Filed: Apr 6, 1981
Inventors
Joseph V. Page
Henry P. Hanneken
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.