High Point SARL ("High Point") appealed a grant of summary judgment dismissing its lawsuit on the grounds of equitable estoppel and laches. The Federal Circuit affirmed on equitable-estoppel grounds and declined to consider laches. Reviewing the application of equitable estoppel under an abuse-of-discretion standard, the Federal Circuit concluded that High Point and its predecessors' silence and misleading conduct as to infringement concerns and their active involvement in licensing arrangements with Sprint and other potentially infringing vendors, coupled with Sprint's detrimental reliance and resulting economic and evidentiary prejudice, supported a finding of equitable estoppel.
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