Inventor
LIU JEFFREY F
US8 patents
Patents
8 patentsUS6311893B1Nov 6, 2001
Optical data access system with data card reader having a single rotational moving pickup head
DCARD INC15 citations91
US6775080B2Aug 10, 2004
Data access device implemented with open and closed control loops to access data stored in discrete stepwise segments
DCARD INC9 citations72
US6728059B2Apr 27, 2004
Magnetic data card servo writer
DCARD INC7 citations72
US6502755B2Jan 7, 2003
Optical data storage card
DCARD INC6 citations72
US6417980B1Jul 9, 2002
Magnetic data card servo writer
DCARD INC5 citations72
US6339569B1Jan 15, 2002
Optical data card servo writer
DCARD INC5 citations72
US6307709B1Oct 23, 2001
Magnetic data storage card
DCARD INC4 citations72
US6934098B2Aug 23, 2005
Data card with a full circular track for alignment and amplitude calibration
DCARD INC8 citations71