Granted Patent
Utility
US 4,742,421 · App. 06/889,715
Magnetic recording disc having tensioned and elastically-supported recording surface
Inventors:
Kunihira Seto, Kengo Oishi
Patented Case
View Patent ↗
Granted: May 3, 1988
Filed: Jul 28, 1986
Inventors
Kunihira Seto
Kengo Oishi
Assignee (at issue)
Fujitsu Limited
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.