Granted Patent
Utility
US 6,019,470 · App. 08/849,386
Progressive multifocal lens and manufacturing method of eyeglass lens and progressive multifocal lens
Inventors:
Hiroyuki Mukaiyama, Kazutoshi Kato
Patented Case
View Patent ↗
Granted: Feb 1, 2000
Filed: Jun 3, 1997
Inventors
Hiroyuki Mukaiyama
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.