Granted Patent
Utility
US 5,260,439 · App. 07/808,240
Polymerizable monomer having at least one isopropenyl phenyl group and being capable of forming a high surface hardness transparent resin
Inventors:
Toshiyuki Suzuki, Katsuyoshi Sasagawa, Masao Imai, Yoshinobu Kanemura
Patented Case
View Patent ↗
Granted: Nov 9, 1993
Filed: Dec 16, 1991
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.