Granted Patent
Utility
US 4,472,750 · App. 06/280,138
Data record with pre-recorded transducer positioning signals, and system for utilizing same
Inventors:
Marlin K. Klumpp, Joseph H. Mueller, Francis Lum, Samuel N. Irwin
Patented Case
View Patent ↗
Granted: Sep 18, 1984
Filed: Jul 2, 1981
Inventors
Marlin K. Klumpp
Joseph H. Mueller
Francis Lum
Samuel N. Irwin
Assignee (at issue)
Irwin Magnetic Systems, Inc.
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.