Granted Patent
Utility
US 6,833,972 · App. 10/277,983
Method for reproducing phase information signals in an information recording device
Inventors:
Taizou Hamada, Yasuaki Ban
Patented Case
View Patent ↗
Granted: Dec 21, 2004
Filed: Oct 23, 2002
Inventors
Taizou Hamada
Yasuaki Ban
Assignee (at issue)
SUMITOMO ELECTRIC INDUSTRIES, LTD.
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.