Granted Patent
Utility
US 4,539,251 · App. 06/622,221
Surface coated Sialon-base ceramic materials for tools
Inventors:
Taijiro Sugisawa, Teruyoshi Tanase
Patented Case
View Patent ↗
Granted: Sep 3, 1985
Filed: Jun 19, 1984
Inventors
Taijiro Sugisawa
Teruyoshi Tanase
Assignee (at issue)
Mitsubishi Kinzoku Kabushiki Kaisha
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.