Granted Patent
Utility
US 4,439,247 · App. 06/443,556
Method for manufacture of high-strength high-electroconductivity copper alloy
Inventors:
Kishio Arita, Toshio Takahashi, Akio Miyoshi, Hajime Izumimori, Mitsushi Ishida
Patented Case
View Patent ↗
Granted: Mar 27, 1984
Filed: Nov 22, 1982
Inventors
Kishio Arita
Toshio Takahashi
Akio Miyoshi
Hajime Izumimori
Mitsushi Ishida
Assignees (at issue)
SUMITOMO METAL MINING CO., LTD.
Nippon Telegraph and Telephone Public Corporation
Nippon Telecommunication Engineering Company
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.