64 F.4th 1274
Fed. Cir.2023Background
- Ironburg owns U.S. Patent No. 8,641,525, directed to a handheld video‑game controller with back controls that include an “elongate member” that “extends substantially the full distance between the top edge and the bottom edge” and is “inherently resilient and flexible.”
- Valve’s Steam Controller was accused of infringing claims; after filing an IPR that was partially instituted, the PTAB cancelled several claims but declined to institute on other grounds (Non‑Instituted Grounds). A later third‑party IPR raised additional prior‑art grounds (Non‑Petitioned Grounds).
- The case was tried (remotely by Zoom) in the W.D. of Washington; each juror was mailed a Steam Controller to examine. The jury found willful infringement and awarded about $4.02 million in damages.
- District court denied Valve’s JMOL/new‑trial motions (including challenges to admission/exclusion of testimony from Ironburg’s co‑inventor (Ironmonger) and Valve’s GC (Quackenbush)), denied enhancement of damages, and applied IPR estoppel to both the Non‑Instituted and Non‑Petitioned Grounds.
- On appeal the Federal Circuit: affirmed that the challenged claim terms are not indefinite; affirmed infringement and willfulness; affirmed denial of enhanced damages; affirmed estoppel as to Non‑Instituted Grounds; vacated and remanded the estoppel ruling as to the Non‑Petitioned Grounds because the district court placed the burden on Valve instead of on Ironburg to prove what a skilled searcher reasonably could have discovered.
Issues
| Issue | Ironburg's Argument | Valve's Argument | Held |
|---|---|---|---|
| Indefiniteness of “elongate member” | Term has ordinary meaning and the specification/figures and stated purpose (usable by middle/ring/little fingers across hand sizes) give reasonable certainty. | Term is vague—no objective guidance how much longer than wide; and “substantially the full distance” is unclear where to measure. | Affirms: neither “elongate member” nor “substantially the full distance between the top edge and the bottom edge” is indefinite. Court finds intrinsic evidence and purpose provide objective boundaries. |
| Infringement and admissibility of Ironmonger/Quackenbush testimony | Jury could inspect device; expert and inventor testimony support infringement; Ironmonger’s testimony was factual re: letter/knowledge. | Insufficient evidence that accused device is inherently resilient/flexible; admission of Ironmonger’s opinion and exclusion of GC testimony prejudiced Valve. | Affirms denial of JMOL/new trial: substantial evidence supports infringement; Ironmonger testimony admissible (or harmless if error); exclusion of Quackenbush testimony appropriate due to discovery/privilege. |
| Willfulness and district court’s striking of JMOL as moot | Ironburg: evidence (notice, Quackenbush’s conduct, no design‑around) supports willfulness. | Valve: JMOL that infringement was not willful should have been granted; district court erred calling motion moot. | Affirms willfulness. Court finds district court erred treating motion as moot but error harmless; substantial evidence supports willfulness. |
| IPR estoppel — scope for Non‑Instituted and Non‑Petitioned Grounds | Estoppel applies to grounds raised in petition and to grounds a skilled searcher reasonably could have raised; patentee may invoke estoppel. | Valve: Non‑Instituted Grounds weren’t instituted; Non‑Petitioned Grounds could not reasonably have been raised in Valve’s IPR. | Mixed: Affirmed estoppel as to Non‑Instituted Grounds (they were in the petition). Vacated and remanded as to Non‑Petitioned Grounds because district court placed burden on Valve; burden rests on patentee to prove by preponderance that a skilled searcher exercising reasonable diligence would have found those grounds. |
| Enhanced damages | Ironburg: willfulness supports enhancement. | Valve: no egregious misconduct or copying; denial appropriate. | Affirmed: district court did not abuse discretion in denying enhanced damages. |
Key Cases Cited
- Nautilus, Inc. v. Biosig Instruments, Inc., 572 U.S. 898 (2014) (patent claims must inform skilled artisan of scope with reasonable certainty)
- Biosig Instruments, Inc. v. Nautilus, Inc., 783 F.3d 1374 (Fed. Cir. 2015) (words of degree require objective standard in context)
- Exmark Mfg. Co. v. Briggs & Stratton Power Prods. Grp., 879 F.3d 1332 (Fed. Cir. 2018) (rejecting indefiniteness challenge to similar "elongated" claim language)
- Dow Chem. Co. v. Nova Chems. Corp., 803 F.3d 620 (Fed. Cir. 2015) (measurement claims indefinite where patent fails to teach how to measure and competing measurement methods yield different results)
- Teva Pharm. USA, Inc. v. Sandoz, Inc., 789 F.3d 1335 (Fed. Cir. 2015) (claims requiring a measurement can be indefinite if intrinsic record fails to teach which measurement method to use)
- Halo Elecs., Inc. v. Pulse Elecs., Inc., 579 U.S. 93 (2016) (enhanced damages reserved for egregious cases; willfulness and enhancement are distinct inquiries)
- Presidio Components, Inc. v. Am. Technical Ceramics Corp., 875 F.3d 1369 (Fed. Cir. 2017) (distinguishing indefiniteness from infringement where claim purpose provides calibration guidance)
- Click‑to‑Call Techs. LP v. Ingenio, Inc., 45 F.4th 1363 (Fed. Cir. 2022) (statutory estoppel under §315(e)(2) applies to grounds that reasonably could have been raised in the petition)
- Grace Instrument Indus., LLC v. Chandler Instruments Co., 57 F.4th 1001 (Fed. Cir. 2023) (terms of degree can be definite where intrinsic record provides objective boundary tied to function)