Granted Patent
Utility
US 5,069,848 · App. 07/498,975
Extrusion process of polyimide and polyimide pellet used for the process
Inventors:
Masumi Saruwatari, Syoichi Tsuji, Yasuhiro Fujii
Patented Case
View Patent ↗
Granted: Dec 3, 1991
Filed: Mar 26, 1990
Inventors
Masumi Saruwatari
Syoichi Tsuji
Yasuhiro Fujii
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.