Granted Patent
Utility
US 5,307,021 · App. 07/946,171
Phase-error detecting circuit for QDPSK demodulator
Inventor:
Yoshiaki Ishizeki
Patented Case
View Patent ↗
Granted: Apr 26, 1994
Filed: Sep 17, 1992
Inventor
Yoshiaki Ishizeki
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.