Granted Patent
Utility
US 5,289,330 · App. 07/771,043
Helical read/write head having a cross-cut groove
Inventor:
Gerald J. Wade
Patented Case
View Patent ↗
Granted: Feb 22, 1994
Filed: Oct 2, 1991
Inventor
Gerald J. Wade
Assignee (at issue)
Alliant Techsystems Inc.
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.