Granted Patent
Utility
US 6,025,970 · App. 08/908,742
Digital demodulation of a complementary two-frequency servo PES pattern
Inventor:
Wayne Leung Cheung
Patented Case
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Granted: Feb 15, 2000
Filed: Aug 7, 1997
Inventor
Wayne Leung Cheung
Assignee (at issue)
International Business Machines 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.