Ring-Back Patent Invalid, Cingular Claims
Ring Plus Inc. sued Cingular last September, accusing the telecommunications giant of trampling its patent for the emerging and lucrative ring-back services, which can turn handsets into ads while callers wait for calls to go through.
In its motion filed on Monday, however, Cingular countered that a U.S. Patent and Trademark Office examiner granted the ‘068 patent without knowing about the...
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