Granted Patent
Utility
US 4,330,331 · App. 06/252,898
Electric contact material and method of producing the same
Inventors:
Koichi Fujiwara, Goro Yamauchi, Kishio Arita, Shigeyuki Tsurumi
Patented Case
View Patent ↗
Granted: May 18, 1982
Filed: Apr 10, 1981
Inventors
Koichi Fujiwara
Goro Yamauchi
Kishio Arita
Shigeyuki Tsurumi
Assignee (at issue)
Nippon Telegraph and Telephone Public 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.