Google's Nexus 7 discovered to have Smart Cover-like magnetic sensor

RIM mobile phones have for years and years (least as long as I remember) had a magnetic sensor. With a official case that has a magnet in, it will turn the screen off and lock the device once it aligns with the magnet in the case - so pop phone into case on your belt and bingo - screen shuts off and phone locks.<p>So I'm not sure what patent is being violated at all and indeed who's.

Missing from the specs because of Apple's patent?<p><a href="http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&#38;Sect2=HITOFF&#38;u=%2Fnetahtml%2FPTO%2Fsearch-adv.htm&#38;r=16&#38;p=1&#38;f=G&#38;l=50&#38;d=PTXT&#38;S1=%2820120320.PD.%20AND%20Apple.ASNM.%29&#38;OS=ISD/20120320%20AND%20AN/Apple&#38;RS=%28ISD/20120320%20AND%20AN/Apple%29" rel="nofollow">http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&#38;Sec...</a>

Android accessories are often pretty cheap in price and quality. Apple Smart Cover is a well made product.