Granted Patent
Utility
US 4,929,916 · App. 07/321,685
Circuit for detecting a lock of a phase locked loop
Inventor:
Shinri Fukuda
Patented Case
View Patent ↗
Granted: May 29, 1990
Filed: Mar 10, 1989
Inventor
Shinri Fukuda
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.