Granted Patent
Utility
US 5,084,538 · App. 07/486,950
High surface hardness transparent resin prepared from a compound having at least one isopropenyl phenyl group
Inventors:
Toshiyuki Suzuki, Katsuyoshi Sasagawa, Masao Imai, Yoshinobu Kanemura
Patented Case
View Patent ↗
Granted: Jan 28, 1992
Filed: Mar 1, 1990
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.