A Delaware jury has ruled Riverbed's (RVBD +0.9%) bread-and-butter Steelhead WAN optimization hardware infringes two software patents held by rival Silver Peak. Though Riverbed was cleared of literal infringement, it was ruled guilty based on the doctrine of equivalents.
Markman Advisors thinks Riverbed could face an injunction on its RiOS OS, which powers its Steelhead hardware. Riverbed insists the patents cover "two minor optional features" within RiOS, and that the ruling "will not have any impact on our business or customers."
The company adds it "fully [expects] to prevail before the District Court on post-trial motions."
Shares shrugged off the verdict after initially dipping lower. They remain 5% below Elliott Management's rejected $21/share offer price.