Granted Patent
Utility
US 4,854,968 · App. 07/137,213
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 8, 1989
Filed: Dec 22, 1987
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.