Fujitsu Ltd. v. Netgear Inc., 620 F.3d 1321 (Fed. Cir. 2010), was a patent infringement case centered on three patents claimed to be required for full compliance of the IEEE 802.11 (WiFi) standard and the WiFi Alliance Wireless Multimedia Extensions (WMM) Specification. US patents 4,975,952, 6,018,642, and 6,469,993 were owned by Philips Electronics, Fujitsu, and LG Electronics respectively, and placed in the Via Licensing pool. The Via Licensing pool claimed to hold all patents required for a complete WiFi/WMM implementation. Netgear did not enter an agreement with Via Licensing but produced a series of products that conform to the WiFi standard and WMM Specification. Philips Electronics, Fujitsu, and LG Electronics sued Netgear for patent infringement claiming a complete implementation of the WiFi standard implied violating patents held by Via Licensing pool. When tried in United States District Court for the Western District of Wisconsin, the court granted summary judgment of non-infringement by Netgear for all three patents thus plaintiffs appealed. The United States Court of Appeals for the Federal Circuit confirmed non-infringement for two of the three patent and found infringement of the third patent in four of Netgear's products.
Background
Fujitsu, LG Electronics, and Philips Electronics were participating in the Via licensing pool and hold US patents 6,018,642, 6,469,993 and 4.974,952 respectively that were claimed to be required for complete implementation of the IEEE 802.11 (WiFi) standard and the WiFi Alliance Wireless Multi-Media (WMM) Specification. Via licensing Pool sent letters several times from 2005 to 2007 to Netgear noticing that its products that were compliant with the 802.11 standard had infringed patents included in the licensing pool. However, Netgear's request that Via Licensing Pool inform specifically which of its products infringed which portions of those patents was ignored and Netgear didn't accept its suggestion on licensing. On December 17, 2007, Plaintiffs sued Netgear for patent infringement and Netgear did seek summary judgment for noninfringement
Specific issue in this case
Standard patent
Plaintiffs' suit was based upon the theory that "networks conforming with IEEE standard also conformed to the patent in suit". Stated simply, plaintiffs attempted to prove infringement by Netgear's products by showing that those products that practice WiFi standard and WMM Specification necessarily infringe three patents in suit. The district court pointed out that the central issue here is whether mere implementation of WiFi standard by Netgear's products made Netgear automatically liable for infringement of patents placed in the licensing pool related to the 801.11 standard and related Specification.
Grouping
Throughout the trial, plaintiffs adhered to the strategy to group the accused products when providing evidence of infringement. Plaintiffs argued that grouping of products when submitting evidence was proper based on their expert's testimony saying that "different versions of the same product will typically support the same feature set". However, the district court was very careful to accept the evidence based on the grouping strategy, explaining that plaintiffs' argument that three separate patents had been infringed by more than 260 products of Netgear made it not easy to prove which components of which allegedly infringing products actually infringed which portions of the three patents.
Opinion of The district court and The court of appeals
The District Court for Western District of Wisconsin (The district court) denied all of the three motions for summary of judgment filed by plaintiffs and granted motion for summary judgment of non-infringement by Netgear.
Analysis of the Courts on US patent 952
Patent claim analysis (Clarification of the terms used in claim) US patent 4,975,952 claims a method of transmitting data in a wireless network, specifically fragmenting large messages into smaller messages to avoid resending large amounts of data if network transmission errors occur and, thus, to transfer data more reliably.