Granted Patent
Utility
US 4,456,974 · App. 06/330,442
Magnetic bubble device
Inventor:
Paul V. Cooper
Patented Case
View Patent ↗
Granted: Jun 26, 1984
Filed: Dec 14, 1981
Inventor
Paul V. Cooper
Assignee (at issue)
Plessey Overseas 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.