Granted Patent
Utility
US 5,294,356 · App. 07/856,956
Polycarbonates, uses thereof, processes for preparing and purifying same
Inventors:
Masahide Tanaka, Yoshihisa Kiso, Kazunori Takahata, Tetsuo Hayashi, Kenji Shimamoto, Kinya Mizui, Tadaaki Fujimoto, Kosei Nakamura
Patented Case
View Patent ↗
Granted: Mar 15, 1994
Filed: May 14, 1992
Inventors
Masahide Tanaka
Yoshihisa Kiso
Kazunori Takahata
Tetsuo Hayashi
Kenji Shimamoto
Kinya Mizui
Tadaaki Fujimoto
Kosei Nakamura
Assignee (at issue)
Mitsui Petrochemical Industries, Ltd.
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.