Granted Patent
Utility
US 5,177,656 · App. 07/650,594
Flexible magnetic disc cassettes with integrally molded wear button
Inventor:
Patrick M. Hughes
Patented Case
View Patent ↗
Granted: Jan 5, 1993
Filed: Feb 5, 1991
Inventor
Patrick M. Hughes
Assignee (at issue)
Hoechst Celanese 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.