Granted Patent
Utility
US 6,193,370 · App. 09/292,979
Method of manufacturing progressive power spectacle lenses
Inventor:
Moriyasu Shirayanagi
Patented Case
View Patent ↗
Granted: Feb 27, 2001
Filed: Apr 16, 1999
Inventor
Moriyasu Shirayanagi
Assignee (at issue)
Asahi Kogaku Kabushiki Kaisha
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.