Granted Patent
Utility
US 5,145,927 · App. 07/487,212
High surface hardness transparent resin prepared from a compound having terminal isopropenyl phenyl groups
Inventors:
Toshiyuki Suzuki, Katsuyoshi Sasagawa, Masao Imai, Yoshinobu Kanemura
Patented Case
View Patent ↗
Granted: Sep 8, 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.