Granted Patent
Utility
US 4,231,071 · App. 05/925,534
Reader for data recorded on magnetic disks at plural densities
Inventor:
Albert L. Anderson
Patented Case
View Patent ↗
Granted: Oct 28, 1980
Filed: Jul 17, 1978
Inventor
Albert L. Anderson
Assignee (at issue)
Digital Equipment 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.