Granted Patent
Utility
US 5,202,089 · App. 07/700,962
Precipitation-hardenable tool steel
Inventors:
Lars-Ake Norstrom, Henrik Jespersson
Patented Case
View Patent ↗
Granted: Apr 13, 1993
Filed: May 16, 1991
Inventors
Lars-Ake Norstrom
Henrik Jespersson
Assignee (at issue)
Uddeholm Tooling Aktiebolag
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.