Granted Patent
Utility
US 4,801,372 · App. 06/914,426
Optically anisotropic pitch
Inventors:
Kazuhito Tate, Hajime Yoshida, Teruhiko Sasaki
Patented Case
View Patent ↗
Granted: Jan 31, 1989
Filed: Oct 2, 1986
Inventors
Kazuhito Tate
Hajime Yoshida
Teruhiko Sasaki
Assignee (at issue)
Mitsubishi Oil 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.