Granted Patent
Utility
US 6,652,097 · App. 10/268,755
Progressive-power spectacle lens
Inventor:
Moriyasu Shirayanagi
Patented Case
View Patent ↗
Granted: Nov 25, 2003
Filed: Oct 11, 2002
Inventor
Moriyasu Shirayanagi
Assignee (at issue)
Pentax Corporation
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.