Granted Patent
Utility
US 4,775,733 · App. 07/019,622
High-refractivity plastic lens resin formed by reacting at least one polyisocyanate with at least one polythiol
Inventors:
Yoshinobu Kanemura, Masao Imai, Katsuyoshi Sasagawa, Nobuyuki Kajimoto, Teruyuki Nagata
Patented Case
View Patent ↗
Granted: Oct 4, 1988
Filed: Feb 27, 1987
Inventors
Yoshinobu Kanemura
Masao Imai
Katsuyoshi Sasagawa
Nobuyuki Kajimoto
Teruyuki Nagata
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.