Granted Patent
Utility
US 4,880,460 · App. 07/164,018
Powder metallurgy high speed tool steel article and method of manufacture
Inventors:
Edward J. Dulis, Carl J. Dorsch, William Stasko
Patented Case
View Patent ↗
Granted: Nov 14, 1989
Filed: Mar 4, 1988
Inventors
Edward J. Dulis
Carl J. Dorsch
William Stasko
Assignee (at issue)
Crucible Materials Corporation
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.