Granted Patent
Utility
US 4,255,466 · App. 05/768,369
Carbon electrode and manufacture thereof
Inventors:
Isamu Natsume, Yoshimichi Kobayashi, Toshinao Itou
Patented Case
View Patent ↗
Granted: Mar 10, 1981
Filed: Feb 14, 1977
Inventors
Isamu Natsume
Yoshimichi Kobayashi
Toshinao Itou
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.