Monitoring the effect of read/write element on the effective optical constants of the Al.sub.2 O.sub.3 film by using a reflectometer

Granted: Apr 8, 1997 Filed: Jul 26, 1996

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.