Granted Patent
Utility
US 4,927,470 · App. 07/256,840
Thin gauge aluminum plate product by isothermal treatment and ramp anneal
Inventor:
Alex Cho
Patented Case
View Patent ↗
Granted: May 22, 1990
Filed: Oct 12, 1988
Inventor
Alex Cho
Assignee (at issue)
Aluminum Company of America
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.