Granted Patent
Utility
US 4,654,276 · App. 06/857,019
Magnetic recording medium with an underlayer and a cobalt-based magnetic layer
Inventors:
Richard H. Ahlert, James K. Howard, Grace S. Lim
Patented Case
View Patent ↗
Granted: Mar 31, 1987
Filed: Apr 29, 1986
Inventors
Richard H. Ahlert
James K. Howard
Grace S. Lim
Assignee (at issue)
International Business Machines 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.