Granted Patent
Utility
US 4,907,113 · App. 07/079,117
Three-pole magnetic recording head
Inventor:
Michael Mallary
Patented Case
View Patent ↗
Granted: Mar 6, 1990
Filed: Jul 29, 1987
Inventor
Michael Mallary
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.