Summary
The Federal Circuit affirmed summary judgment that Centraal Corporation's RealNames system did not infringe Netword's patent, either literally or under the doctrine of equivalents. The court construed claim 1 as requiring a local server with a limited alias database that could request updates from a central registry, and held that the RealNames system lacked that local-server functionality. The court also affirmed the district court's consideration of inventor communications and expert technical testimony and denied a motion to strike portions of Netword's reply brief.
Topics
Practice areas
Questions Presented
- Whether claim 1 requires a local server computer to maintain a limited database of aliases and request updates from a central registry computer.
- Whether the RealNames system literally infringed claim 1 under the proper claim construction.
- Whether the RealNames system infringed claim 1 under the doctrine of equivalents.
- Whether the district court improperly relied on an inventor's unprivileged communication with a patent attorney and on expert testimony in construing the claims.
- Whether Centraal's motion to strike portions of Netword's reply brief should be granted.
Holdings
- Claim 1 requires a local server computer that has a limited database of aliases and may request updates from a central registry computer; the district court correctly construed the claim to include those functions.
- The RealNames system did not literally infringe claim 1 because it lacked the claimed local-server caching and information-pulling functions.
- The RealNames system did not infringe claim 1 under the doctrine of equivalents because it lacked an element identical or equivalent to the claimed local server computer.
- The district court did not commit reversible error by considering an inventor's unprivileged communication with a patent attorney as evidence or by relying on an expert's technical explanation of the systems.
- The motion to strike was denied because Netword was entitled to respond to a potentially material argument first raised in Centraal's appellee brief.
Key quotations
“The role is neither to limit nor to broaden the claims, but to define, as a matter of law, the invention that has been patented.” (242 F.3d at 1352)
“Thus the claims are construed to state the legal scope of each patented invention, on examination of the language of the claims, the description in the specification, and the prosecution history.” (242 F.3d at 1352)
“To establish literal infringement, all of the elements of the claim, as correctly construed, must be present in the accused system.” (242 F.3d at 1354)
“Thus the all-elements rule is not satisfied by the Centraal system.” (242 F.3d at 1355)
“When a potentially material issue or argument in defense of the judgment is raised for the first time in the appellee's brief, fundamental fairness requires that the appellant be permitted to respond, lest the appellate court deem the point conceded.” (242 F.3d at 1356)
Factual background
Netword's '906 patent claimed a distributed computer-network system using aliases to locate and retrieve Internet resources. The accused RealNames system also used aliases but employed Resolver computers containing complete database copies and receiving periodic updates pushed from a central computer, rather than local intermediary servers that maintained limited caches and pulled information from a central registry. Netword did not dispute the technical description of the RealNames system offered by Centraal's expert.
Procedural history
The district court construed claim 1 of Netword's patent as requiring a local server with a limited alias database that could request updates from a central registry, then granted Centraal summary judgment of noninfringement. Netword appealed, challenging claim construction, the infringement determination, evidentiary rulings, and the motion to strike. The Federal Circuit affirmed the judgment of noninfringement and denied the motion to strike.