Granted Patent
Utility
US 4,717,493 · App. 06/914,522
Preparation of magnetic coating
Inventors:
Duncan W. Frew, Zorro Stefanini, Edward A. Schnee, Leo di Ricco
Patented Case
View Patent ↗
Granted: Jan 5, 1988
Filed: Oct 3, 1986
Inventors
Duncan W. Frew
Zorro Stefanini
Edward A. Schnee
Leo di Ricco
Assignee (at issue)
Unisys 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.