 Activision , through John Devecka , owns all of Devecka Enterprises ' US and international patents that deal with music games . All patents issued by the USPTO are presumed valid . 
 Activision , through John Devecka , <a href='uninflect' title='1'><mark>owns</mark></a> all of Devecka Enterprises <a href='null_genetive' title='2'><mark>'</mark></a>US and international patents <a href='null_relcl' title='3'><mark>that</mark></a>deal with music games . All patents issued by the USPTO are presumed valid . 
Activision , through John Devecka , own all of Devecka Enterprises  US and international patents deal with music games . All patents issued by the USPTO r presumed valid .