Granted Patent
Utility
US 5,440,358 · App. 08/107,975
Optical lens comprised of high surface hardness transparent resin
Inventors:
Toshiyuki Suzuki, Katsuyoshi Sasagawa, Masao Imai, Yoshinobu Kanemura
Patented Case
View Patent ↗
Granted: Aug 8, 1995
Filed: Aug 18, 1993
Inventors
Toshiyuki Suzuki
Katsuyoshi Sasagawa
Masao Imai
Yoshinobu Kanemura
Assignee (at issue)
Mitsui Toatsu Chemicals, Incorporated
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.