Granted Patent
Utility
US 5,476,602 · App. 08/170,809
Polycarbonates, uses thereof, processes for preparing and purifying same
Inventors:
Masahide Tanaka, Tadaaki Fujimoto, Tetsuo Hayashi, Takashi Hayashi, Kazunori Takahata
Patented Case
View Patent ↗
Granted: Dec 19, 1995
Filed: Dec 21, 1993
Inventors
Masahide Tanaka
Tadaaki Fujimoto
Tetsuo Hayashi
Takashi Hayashi
Kazunori Takahata
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.