Granted Patent
Utility
US 5,886,766 · App. 08/656,291
Progressive multifocal lens and manufacturing method therefor
Inventors:
Tadashi Kaga, Kazutoshi Kato
Patented Case
View Patent ↗
Granted: Mar 23, 1999
Filed: Jun 6, 1996
Inventors
Tadashi Kaga
Kazutoshi Kato
Assignee (at issue)
SEIKO EPSON 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.