Granted Patent
Utility
US 5,446,508 · App. 08/198,059
Progressive power lens
Inventor:
George A. Kitchen
Patented Case
View Patent ↗
Granted: Aug 29, 1995
Filed: Feb 18, 1994
Inventor
George A. Kitchen
Assignee (at issue)
BMC 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.