Granted Patent
Utility
US 5,612,015 · App. 08/322,376
Carbon fibers and process for their production
Inventors:
Iwao Yamamoto, Hiroyuki Aikyo
Patented Case
View Patent ↗
Granted: Mar 18, 1997
Filed: Oct 13, 1994
Inventors
Iwao Yamamoto
Hiroyuki Aikyo
Assignee (at issue)
MITSUBISHI CHEMICAL CORPORATION
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.