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US007509179B2
(12) United States Patent ao) Patent No.: Us 7,509,179 B2
Matsumoto et al. (45) Date of Patent: Mar. 24,2009
Abe, Toyonaka (JP)
Assignee: Panasonic Corporation, Osaka (JP)
Notice: Subject to any disclaimer, the term of this patent is extended or adjusted under 35 U.S.C. 154(b) by 1953 days.
Appl.No.: 09/940,590
Filed: Aug. 29, 2001
Prior Publication Data
US 2002/0025141 Al Feb. 28, 2002
Foreign Application Priority Data
. 29, 2000 (JP) 2000-258534
Int. CI.
G06F17/00 (2006.01)
U.S. CI 700/94
Field of Classification Search 700/94;
380/28, 201, 203 See application file for complete search history.
