Granted Patent
Utility
US 4,900,650 · App. 07/193,417
Method of producing a pole piece with improved magnetic domain structure
Inventor:
Shyam C. Das
Patented Case
View Patent ↗
Granted: Feb 13, 1990
Filed: May 12, 1988
Inventor
Shyam C. Das
Assignee (at issue)
Digital Equipment Corporation
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.