Granted Patent
Utility
US 4,756,856 · App. 06/684,097
Method of and apparatus for forming surface of magnetic media
Inventor:
Edward J. Choinski
Patented Case
View Patent ↗
Granted: Jul 12, 1988
Filed: Dec 20, 1984
Inventor
Edward J. Choinski
Assignee (at issue)
Polaroid 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.