Granted Patent
Utility
US 4,469,512 · App. 06/403,023
Process for producing high-purity aluminum
Inventors:
Hideo Shingu, Kozo Arai, Masashi Sakaguchi, Toshio Nishide, Osamu Watanabe, Yasushi Tashiro, Ryotatsu Otsuka, Kenji Tsukamoto
Patented Case
View Patent ↗
Granted: Sep 4, 1984
Filed: Jul 29, 1982
Inventors
Hideo Shingu
Kozo Arai
Masashi Sakaguchi
Toshio Nishide
Osamu Watanabe
Yasushi Tashiro
Ryotatsu Otsuka
Kenji Tsukamoto
Assignee (at issue)
Showa Aluminum Corp.
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.