Granted Patent
Utility
US 5,745,211 · App. 08/578,237
Progressive power lens and eye glass lens
Inventors:
Hiroyuki Mukaiyama, Tadashi Kaga
Patented Case
View Patent ↗
Granted: Apr 28, 1998
Filed: Dec 26, 1995
Inventors
Hiroyuki Mukaiyama
Tadashi Kaga
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.