Background
Michael Kaufman sued Microsoft Corporation for infringement of a patent covering methods for using a computer to automatically generate an end-user interface for working with data in a relational database — broadly, a system for automatically creating graphical user interfaces (GUIs) that allow non-technical users to interact with database records. Kaufman alleged that certain Microsoft products infringed this patent, and a jury found in his favor and awarded $7 million in damages.
On appeal, Microsoft raised several challenges to the verdict, including arguing that certain claim terms had been improperly construed and that the jury’s damages award was not supported by sufficient evidence. The district court had also denied Kaufman’s request for prejudgment interest on the damages award, a form of compensation that reflects the time value of money during the period between the infringement and the judgment. Both parties appealed aspects of the district court’s rulings.
The Court’s Holding
The Federal Circuit affirmed the infringement verdict and the $7 million damages award. The court held that Microsoft had failed to properly preserve its claim construction challenges for appeal: a party must raise its specific claim construction arguments in its opening appellate brief, and Microsoft’s challenge to the constructions of “automatically generated” and the use of the conjunction “and” came too late or in the wrong procedural posture. The court declined to address the forfeited arguments.
On the damages amount, the Federal Circuit found sufficient evidence to support the jury’s award. The patent covered a commercially valuable function implemented in widely used Microsoft products, and the damages testimony provided adequate support for the verdict under the reasonable royalty framework.
On prejudgment interest, however, the Federal Circuit reversed the district court’s denial. Under 35 U.S.C. § 284, courts may award prejudgment interest as part of the damages for patent infringement. Denial of prejudgment interest requires specific findings of delay or prejudice attributable to the patent owner. The district court had denied prejudgment interest without making such findings, and the Federal Circuit held that denial without evidence of the required factors was an abuse of discretion. The case was remanded for recalculation of damages to include prejudgment interest.
Key Takeaways
- Claim construction arguments must be raised and developed in a party’s opening appellate brief; failure to do so forfeits those arguments on appeal, even if the constructions were contested below.
- Prejudgment interest is the default in patent infringement cases; courts may deny it only upon specific findings of delay or prejudice attributable to the patent owner, not as a matter of general discretion.
- A $7 million reasonable royalty damages award for a software patent on user-interface generation is supported when the infringing feature is incorporated into widely distributed commercial products used by large numbers of customers.
- Patent owners who receive a favorable jury verdict should routinely request prejudgment interest and document why no litigation delay warrants its denial.
Why It Matters
The Kaufman v. Microsoft decision addresses two practical aspects of patent litigation that are often overlooked until appeal. First, claim construction preservation: the Federal Circuit regularly enforces strict preservation rules, and arguments not properly raised in an opening brief are forfeited. Litigants who believe a district court’s claim construction was erroneous must make that argument clearly, completely, and promptly in the opening appeal brief.
Second, the prejudgment interest ruling is a useful reminder for patent owners who prevail at trial. Prejudgment interest compensates for the time value of money during the period of infringement and can substantially increase the effective recovery. Courts should award it as the default, and patent owners should challenge any denial that is not based on documented delay or prejudice on their part. The ruling reinforces that district courts do not have unfettered discretion to deny this form of compensation.