Editing Read-copy-update (section)

==Patents==
The technique is covered by [[United States Patent and Trademark Office|U.S.]] [[software patent]] {{US patent|5,442,758}}, issued August 15, 1995, and assigned to [[Sequent Computer Systems]], as well as by {{US patent|5,608,893}} (expired 2009-03-30), {{US patent|5,727,209}} (expired 2010-04-05), {{US patent|6,219,690}} (expired 2009-05-18), and {{US patent|6,886,162}} (expired 2009-05-25).  The now-expired US Patent {{US patent|4,809,168}} covers a closely related technique. RCU is also the topic of one claim in the [[SCO v. IBM#Increased damages claims, and read-copy-update claims|SCO v. IBM]] [[lawsuit]].