Granted Patent
Utility
US 5,037,587 · App. 07/549,149
Preparation process of polyimide film
Inventors:
Masumi Saruwatari, Yasuhiko Ohta, Yasuhiro Fujii, Yasuko Honji, Shoichi Tsuji, Shinobu Moriya
Patented Case
View Patent ↗
Granted: Aug 6, 1991
Filed: Jul 6, 1990
Inventors
Masumi Saruwatari
Yasuhiko Ohta
Yasuhiro Fujii
Yasuko Honji
Shoichi Tsuji
Shinobu Moriya
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.