Granted Patent
Utility
US 4,544,612 · App. 06/532,978
Iron oxide magnetic film and process for fabrication thereof
Inventors:
Osamu Ishii, Fumikatsu Yoshimura, Iwao Hatakeyama
Patented Case
View Patent ↗
Granted: Oct 1, 1985
Filed: Sep 16, 1983
Inventors
Osamu Ishii
Fumikatsu Yoshimura
Iwao Hatakeyama
Assignee (at issue)
Nippon Telegraph and Telephone Public 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.