Matsushita patents granted on 21 April 2009

4 US patents granted on 21 April 2009 and assigned to Matsushita

1 7,522,223 Audio signal delay apparatus and method
2 7,522,149 Display device and information terminal device
3 7,521,858 Organic EL display and method of manufacturing the same
4 7,521,268 Method and apparatus for manufacturing display