Granted Patent
Utility
US 5,191,055 · App. 07/885,251
Mercapto compound, a high refractive index resin and lens and a process for preparing them
Inventors:
Yoshinobu Kanemura, Katsuyoshi Sasagawa, Masao Imai, Toshiyuki Suzuki
Patented Case
View Patent ↗
Granted: Mar 2, 1993
Filed: May 20, 1992
Inventors
Yoshinobu Kanemura
Katsuyoshi Sasagawa
Masao Imai
Toshiyuki Suzuki
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.