850 F.3d 1302
Fed. Cir.2017Background
- Comcast sued Sprint for infringement of three related patents (the Low patents — U.S. Pat. Nos. 8,170,008; 7,012,916; 8,204,046) claiming use of DNS/Internet technology to initiate/route telephone calls through switched telecommunication systems.
- Six accused Sprint call flows: three alleged to infringe the ’008 patent (calls originate on Sprint’s CDMA switched network, traverse an IMS packet-based core using DNS, then proceed to the called party) and three alleged to infringe the ’916 and ’046 patents (using ENUM processing to convert number strings to DNS queries).
- Key disputed claim terms included “switched telecommunication system” (whether it may include any datagram/packet elements) and “parsing” (scope and whether prosecution disclaimer narrowed it).
- A jury found infringement of asserted claims of all three patents and awarded a lump-sum $7.5 million royalty. District court denied Sprint’s JMOL/new-trial motions and awarded prejudgment interest; Sprint appealed.
- The Federal Circuit affirmed: it sustained the district court’s claim constructions, found substantial evidence supported the jury’s infringement findings, rejected Sprint’s prosecution-disclaimer arguments, and upheld the district court’s prejudgment-interest calculation based on a single 2006 hypothetical negotiation and a lump-sum award.
Issues
| Issue | Comcast's Argument | Sprint's Argument | Held |
|---|---|---|---|
| Construction of “switched telecommunication system” (ʼ008 patent) | Plain claim language and specification permit a switched system that may have elements that interface with packet/datagram networks; claims require initiating/setting up a call through a switched system, not exclusive end-to-end switching | Term must exclude any datagram-based elements and require the entire call to travel over a predetermined bearer channel (i.e., exclusively switched) | Affirmed district court: claims do not require exclusive use of a switched network; substantial evidence showed calls were initiated/set up on a switched (CDMA) system, so infringement stands |
| Sufficiency re “call destination” and “identifier of a second party” (ʼ008 patent) | Comcast: ordinary meaning allowed intermediate network servers (MGC, SBC) to qualify as call destinations/identifiers; expert testimony supported that | Sprint: term must mean the final receiving phone (unique final destination/identifier), not intermediate nodes; evidence insufficient | Affirmed: jury instructed on plain meaning (no requested narrower construction); substantial evidence (expert testimony) supported that specific IMS servers were call destinations/identifiers; Sprint’s late construction argument waived at JMOL stage |
| Construction of “parsing” (ʼ916 and ’046 patents) | District court: parsing = an automated process of analyzing a string according to a set of grammar rules; prosecution history did not clearly disclaim broader meanings | Sprint: prosecution statements during reexamination clearly disavowed parsing for certain association/mapping/lookup processes and thus parsing should be narrowly limited | Affirmed: prosecution history not a clear, unmistakable disclaimer; Sprint failed to show prejudice or how a narrower construction would change infringement verdict; district court’s construction stands |
| Prejudgment interest and timing (damages) | Comcast: parties’ experts agreed on a single hypothetical negotiation date (2006) if the ’916 patent was found infringed; a lump-sum royalty should run from that date and interest should be computed on whole award from that date | Sprint: prejudgment interest should be apportioned and run only from each patent’s first infringement date (because two patents issued after 2006), so interest should not run from 2006 on amounts attributable to patents that issued later | Affirmed: experts agreed lump-sum hypothetical negotiation occurred in 2006 (because jury found the ’916 patent infringed); single lump-sum verdict prevents meaningful apportionment; district court did not abuse discretion in applying prejudgment interest from 2006 to the full award |
Key Cases Cited
- ResQNet.com, Inc. v. Lansa, Inc., 594 F.3d 860 (Fed. Cir. 2010) (hypothetical negotiation timing and later-issued patents may be considered in a single negotiation)
- Finisar Corp. v. DirecTV Grp., Inc., 523 F.3d 1323 (Fed. Cir. 2008) (remedy where infringement verdict relies on incorrect claim construction)
- Teleflex, Inc. v. Ficosa N. Am. Corp., 299 F.3d 1313 (Fed. Cir. 2002) (affirming reliance on substantial evidence where correcting claim construction would not change verdict)
- ePlus, Inc. v. Lawson Software, Inc., 700 F.3d 509 (Fed. Cir. 2012) (party cannot reframe claim-construction arguments as insufficiency of evidence when it failed to request a narrower jury instruction)
- Hewlett-Packard Co. v. Mustek Sys., Inc., 340 F.3d 1314 (Fed. Cir. 2003) (verdict tested by the charge actually given; late claim construction arguments disfavored)
- Omega Eng'g, Inc. v. Raytek Corp., 334 F.3d 1314 (Fed. Cir. 2003) (prosecution disclaimer requires clear and unmistakable statements)
- Cordis Corp. v. Medtronic AVE, Inc., 339 F.3d 1352 (Fed. Cir. 2003) (ambiguity in prosecution history precludes finding disclaimer)
- Lucent Techs., Inc. v. Gateway, Inc., 525 F.3d 1200 (Fed. Cir. 2008) (prosecution arguments may distinguish prior art without narrowing claim term as defendant urges)
- Gen. Motors Corp. v. Devex Corp., 461 U.S. 648 (U.S. 1983) (prejudgment interest generally awarded absent justification)
- Energy Transp. Grp., Inc. v. William Demant Holding A/S, 697 F.3d 1342 (Fed. Cir. 2012) (award of prejudgment interest reviewed for abuse of discretion)
- Bio-Rad Labs., Inc. v. Nicolet Instrument Corp., 807 F.2d 964 (Fed. Cir. 1986) (purpose of prejudgment interest is to put the patentee in the position if a reasonable royalty had been agreed)
- Stickle v. Heublein, Inc., 716 F.2d 1550 (Fed. Cir. 1983) (when parties treat related patents as unitary licensing property, damages need not be determined per patent)