Andersen Corporation owns a number of patents relating to composite materials made from a mixture of polymer and wood fiber, and to structural parts made from those composite materials. Fiber Composites, LLC, manufactures and sells deck railing and spindle products (the “Fiberon products”), which are made from a polymer and wood fiber mixture. Andersen brought this action in the United States District Court for the District of Minnesota, alleging that the Fiberon products infringe six of its patents.
The parties have classified the six asserted patents into two groups. The four Group I patents cover compositions capable of being extruded into structural members. The two Group II patents cover the extruded structural members themselves. The parties agree that the disputed claim terms—“composite composition” for the Group I patents and “composite structural member” for the Group II patents—have the same meaning throughout each respective group.
The Fiberon products are made by direct extrusion, a process in which polymer and wood fibers are mixed and melted in an extruder and then forced through a die to form a finished structural part. Fiber contends that its products do not infringe any of the asserted patents because the “composite compositions” of the Group I patents are limited to compositions in either pellet or linear extrudate form, and because the “composite structural members” of the Group II patents are limited to members that are extruded from composites that have previously been extruded into either pellet or linear extrudate form.
After a hearing, the district court agreed with Fiber that the “composite compositions” claimed in the Group I patents are limited to materials that have been extruded to make pellets or the linear extrudate from which pellets can be cut. The court agreed with Andersen, however, that the “composite structural members” claimed in the Group II patents constitute any articles that are made from a composite polymer and wood fiber mixture and have load-bearing capabilities. The court rejected Fiber’s contention that “composite structural members” are limited to items made from a composite mixture that has previously been extruded into pellet or linear extrudate form.
Based on the district court’s construction of the term “composite composition,” Andersen modified its theory of infringement to allege that its Group I patents are infringed by Fiber’s “repro,” a substance made from reground rejected railing parts and used as an ingredient in the manufacturing process. Following discovery, both parties moved for summary judgment. The district court held that Fiber’s “repro” did not infringe the Group I patents, but that a subset of the Fiberon products (those with more than 30% wood content) infringed the Group II patents.
At trial, the jury found that (1) the Group II patents are not invalid due to obviousness, inadequate written description, or lack of enablement, (2) the Group II patents are not invalid due to anticipation, and (3) Fiber’s infringement of the Group II patents was not willful. The jury awarded Andersen $46,020 in damages. The district court denied Andersen’s request for a permanent injunction with regard to the Group II patents.
Download the decision.