Granted Patent
Utility
US 4,857,626 · App. 07/136,758
Wholly aromatic polyester and process for its production
Inventors:
Osamu Kishiro, Atsushi Kasai, Seiichi Nozawa, Hiroshi Kamata
Patented Case
View Patent ↗
Granted: Aug 15, 1989
Filed: Dec 22, 1987
Inventors
Osamu Kishiro
Atsushi Kasai
Seiichi Nozawa
Hiroshi Kamata
Assignee (at issue)
Mitsubishi Chemical 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.