Granted Patent
Utility
US 5,486,971 · App. 07/996,333
Central hubs for flexible magnetic data discs formed of magnetically soft polyacetal compositions
Inventor:
Patrick M. Hughes
Patented Case
View Patent ↗
Granted: Jan 23, 1996
Filed: Dec 23, 1992
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.