Granted Patent
Utility
US 4,776,897 · App. 06/928,783
Method for treating the surface of stainless steel by high temperature oxidation
Inventors:
Haruji Takahashi, Shigeo Goto, Syuichi Takata, Mitsuaki Shibata, Tomihira Hata
Patented Case
View Patent ↗
Granted: Oct 11, 1988
Filed: Nov 10, 1986
Inventors
Haruji Takahashi
Shigeo Goto
Syuichi Takata
Mitsuaki Shibata
Tomihira Hata
Assignee (at issue)
Shinko-Pfaudler Company Ltd.
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.