Granted Patent
Utility
US 5,158,637 · App. 07/583,076
Method of and an apparatus for thermally processing crystalline thermoplastic resin film
Inventors:
Masao Takashige, Takeo Hayashi, Katsumi Utsuki, Masahiro Fujimoto
Patented Case
View Patent ↗
Granted: Oct 27, 1992
Filed: Sep 14, 1990
Inventors
Masao Takashige
Takeo Hayashi
Katsumi Utsuki
Masahiro Fujimoto
Assignee (at issue)
Idemitsu Petrochemical Co., 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.