Granted Patent
Utility
US 6,342,821 · App. 09/491,431
Device capable of QPSK modulation and phase compensator for the same
Inventor:
Dong Won Kim
Patented Case
View Patent ↗
Granted: Jan 29, 2002
Filed: Jan 26, 2000
Inventor
Dong Won Kim
Assignee (at issue)
SK hynix Inc.
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.