Granted Patent
Utility
US 5,848,545 · App. 08/813,280
Extruded material for expansion working and method of expansion working
Inventor:
Hirozo Michisaka
Patented Case
View Patent ↗
Granted: Dec 15, 1998
Filed: Mar 10, 1997
Inventor
Hirozo Michisaka
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.