Granted Patent
Utility
US 4,074,331 · App. 05/728,804
Magnetic recording head structure for recording on both sides of a record member
Inventors:
James M. O'Reilly, Alexander S. Murison
Patented Case
View Patent ↗
Granted: Feb 14, 1978
Filed: Oct 1, 1976
Inventors
James M. O'Reilly
Alexander S. Murison
Assignee (at issue)
Burroughs, 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.