Granted Patent
Utility
US 5,220,294 · App. 07/703,250
Phase-locked loop circuit
Inventor:
Masaomi Ichikawa
Patented Case
View Patent ↗
Granted: Jun 15, 1993
Filed: May 21, 1991
Inventor
Masaomi Ichikawa
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.