Granted Patent
Utility
US 4,980,497 · App. 07/362,338
Monomer of carbonate ester having isopropenylphenyl group
Inventors:
Katsuyoshi Sasagawa, Yoshinobu Kanemura, Masao Imai, Toshiyuki Suzuki
Patented Case
View Patent ↗
Granted: Dec 25, 1990
Filed: Jun 6, 1989
Inventors
Katsuyoshi Sasagawa
Yoshinobu Kanemura
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.