Granted Patent
Utility
US 4,452,860 · App. 06/460,554
Carbon fibers and process for producing the same
Inventors:
Isamu Obama, Yoshihisa Yamamoto
Patented Case
View Patent ↗
Granted: Jun 5, 1984
Filed: Jan 24, 1983
Inventors
Isamu Obama
Yoshihisa Yamamoto
Assignee (at issue)
JAPAN EXLAN COMPANY LIMITED
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.