Granted Patent
Utility
US 4,874,436 · App. 07/237,492
Method for producing high purity electrolytic copper
Inventors:
Takashi Ogata, Masanori Kato, Yoshio Kawasumi, Chikara Tominaga, Kanji Tanaka
Patented Case
View Patent ↗
Granted: Oct 17, 1989
Filed: Aug 26, 1988
Inventors
Takashi Ogata
Masanori Kato
Yoshio Kawasumi
Chikara Tominaga
Kanji Tanaka
Assignee (at issue)
Nippon Mining 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.