Granted Patent
Utility
US 5,384,056 · App. 08/003,426
Polycarbonate and use thereof
Inventors:
Masahide Tanaka, Tadaaki Fujimoto, Kazunori Takahata
Patented Case
View Patent ↗
Granted: Jan 24, 1995
Filed: Jan 12, 1993
Inventors
Masahide Tanaka
Tadaaki Fujimoto
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.