Granted Patent
Utility
US 4,525,563 · App. 06/589,251
Oxygen permeable soft contact lens composition
Inventors:
Takanori Shibata, Toshiharu Yoshikawa, Kenichi Isobe, Shoji Ichinohe
Patented Case
View Patent ↗
Granted: Jun 25, 1985
Filed: Mar 13, 1984
Inventors
Takanori Shibata
Toshiharu Yoshikawa
Kenichi Isobe
Shoji Ichinohe
Assignees (at issue)
Toyo Contact Lens Co., Ltd.
Shin-Etsu Chemical 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.