Granted Patent
Utility
US 4,948,102 · App. 07/260,092
Method of preparing high-purity metal and rotary cooling member for use in apparatus therefor
Inventors:
Ryotatsu Otsuka, Shigemi Tanimoto, Kazuo Toyoda
Patented Case
View Patent ↗
Granted: Aug 14, 1990
Filed: Oct 20, 1988
Inventors
Ryotatsu Otsuka
Shigemi Tanimoto
Kazuo Toyoda
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.