Granted Patent
Utility
US 4,436,593 · App. 06/282,540
Self-aligned pole tips
Inventors:
John R. Osborne, Peter G. Bischoff
Patented Case
View Patent ↗
Granted: Mar 13, 1984
Filed: Jul 13, 1981
Inventors
John R. Osborne
Peter G. Bischoff
Assignee (at issue)
Memorex 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.