Granted Patent
Utility
US 5,459,613 · App. 08/195,581
Lead glass composition series for gradient glasses
Inventor:
Xiaojie Xu
Patented Case
View Patent ↗
Granted: Oct 17, 1995
Filed: Nov 24, 1993
Inventor
Xiaojie Xu
Assignee (at issue)
LightPath Technologies, 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.