Granted Patent
Utility
US 4,668,753 · App. 06/899,796
Film-forming propylene copolymer, film thereof and process for production of the film
Inventors:
Norio Kashiwa, Mamoru Kioka, Masaki Kohyama, Masanobu Ishiyama
Patented Case
View Patent ↗
Granted: May 26, 1987
Filed: Aug 25, 1986
Inventors
Norio Kashiwa
Mamoru Kioka
Masaki Kohyama
Masanobu Ishiyama
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.