Granted Patent
Utility
US 4,535,888 · App. 06/571,369
Storage cassette for two or more disk-shaped high memory density information carriers
Inventor:
Frederik B. Nusselder
Patented Case
View Patent ↗
Granted: Aug 20, 1985
Filed: Jan 16, 1984
Inventor
Frederik B. Nusselder
Assignee (at issue)
Polygram GmbH
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.