Granted Patent
Utility
US 4,992,901 · App. 07/480,278
Self aligned magnetic poles using sacrificial mask
Inventors:
Beat G. Keel, Arthur Calderon, Simon Liao
Patented Case
View Patent ↗
Granted: Feb 12, 1991
Filed: Feb 15, 1990
Inventors
Beat G. Keel
Arthur Calderon
Simon Liao
Assignee (at issue)
Seagate Technology LLC
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.