Granted Patent
Utility
US 4,616,273 · App. 06/724,572
Tape recording apparatus provided with a bias control device
Inventors:
Eiichi Ishii, Makoto Yoshimizu
Patented Case
View Patent ↗
Granted: Oct 7, 1986
Filed: Apr 18, 1985
Inventors
Eiichi Ishii
Makoto Yoshimizu
Assignee (at issue)
NEC 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.