Granted Patent
Utility
US 4,849,002 · App. 07/113,936
Ion-exchangeable germanate method for strengthened germanate glass articles
Inventor:
Charles F. Rapp
Patented Case
View Patent ↗
Granted: Jul 18, 1989
Filed: Oct 27, 1987
Inventor
Charles F. Rapp
Assignee (at issue)
Kigre, 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.