Granted Patent
Utility
US 6,135,595 · App. 09/253,698
Eyeglass lenses for correcting color vision
Inventors:
Katsuyoshi Takeshita, Kunihiko Yano, Yoshihiko Kasai, Toshiya Otsuki
Patented Case
View Patent ↗
Granted: Oct 24, 2000
Filed: Feb 22, 1999
Inventors
Katsuyoshi Takeshita
Kunihiko Yano
Yoshihiko Kasai
Toshiya Otsuki
Assignees (at issue)
SEIKO EPSON CORPORATION
World Munsell Co., Ltd.
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.