Yahoo may soon file opposition to AOL’s Instant Messenger trademark at the U-S Patent and Trademark Office (also known as USPTO).  Yahoo’s Attorney David M. Kelly filed four separate requests for additional time to investigate the claim.AOL has used the term “Instant Messenger” since 1997, though several adversaries disputed the term “Instant Messenger” as a general phrase to depict text messaging services and platforms in general.The USPTO overturned previous refusals in 2005, granting AOL the rights to the phrase. The USPTO decided that “instant messaging” remained generic, not Instant Messenger. The ruling said users related Instant Messenger to AOL’s AIM service. Webpronews could not reach a Yahoo spokesperson for a comment as to why Yahoo suddenly filed the opposition.