Voltstar Technologies, Inc. v. Superior Communications, Inc.
2:19-cv-07355
C.D. Cal.Nov 2, 2021Background
- Plaintiff Voltstar sued Superior Communications and AT&T for infringing U.S. Pat. Nos. 7,910,834 and 7,960,648 over Superior Qi wireless charging pads; the dispute here focuses on Claims 31, 32, 39, and 40 of the ’648 Patent.
- Defendants moved for partial summary judgment of non-infringement of those Asserted Claims and separately moved to exclude portions of Voltstar’s expert Dr. John Tobias’s testimony (Daubert).
- The key claim limitations in dispute: (1) “pulse monitoring circuitry operable to monitor the frequency of pulses,” (2) a claimed “transformer” (court construed to require a static two-or-more-coil device), (3) “switching circuitry” located before the transformer, and (4) a limitation that the cable assembly “consumes substantially no power while in the off state” (phantom-load issue).
- Major factual disputes: whether the Accused Devices use the Qi "bit encoding" (frequency/bit-encoding) scheme vs. amplitude-only monitoring; whether a single primary coil plus a remote secondary can satisfy the court’s static transformer construction or at least be equivalent under the doctrine of equivalents (DOE); whether switching circuitry is located upstream of the relevant transformer; and whether the devices’ measured standby/sleep power (e.g., ~180 mW) qualifies as “substantially no power.”
- Rulings in summary: the Court GRANTED-IN-PART and DENIED-IN-PART Defendants’ partial summary judgment motion and likewise GRANTED-IN-PART and DENIED-IN-PART Defendants’ motion to exclude expert testimony.
Issues
| Issue | Voltstar's Argument | Defendants' Argument | Held |
|---|---|---|---|
| Whether Accused Devices have "pulse monitoring circuitry operable to monitor the frequency of pulses" | Devices use the Qi "bit encoding" (frequency/bit-encoding) scheme so circuitry monitors pulse frequency and drives switching | Devices only monitor amplitude; Qi figure is an example and not necessarily used by the products | Genuine factual dispute exists; SJ denied as to this limitation; Tobias's related opinions admissible |
| Whether the Accused Devices include a "transformer" as construed (static, two-or-more coils) | Primary coil plus remote secondary (in the mobile device) can constitute a transformer or be equivalent under DOE | Court’s construction requires a static component of adjacent coils; Accused Devices have only one coil so no literal transformer | Court: no literal infringement (SJ granted on literal aspect); DOE dispute survives (SJ denied as to equivalents); Tobias's literal-transformer opinions/extrinsic evidence excluded |
| Whether the Accused Devices have "switching circuitry" located before the transformer | Switching circuitry exists on the wireless pad and is located before the accused transformer (as Voltstar analyzes the pad) | Switching must be before the wall-charger transformer; no evidence switching is upstream of that transformer | Genuine dispute; SJ denied as to switching-circuitry limitation; Tobias's switching opinions admissible |
| Whether the cable assembly "consumes substantially no power while in the off state" / eliminates phantom load | Measured sleep/standby power (~180 mW) is a large reduction (~98%) from on-state and can qualify as "substantially no power" compared to no-load without the feature | PTO reexamination language and product evidence show standby/phantom draw exists; Voltstar did not compare to a proper no-load baseline | Genuine dispute; SJ denied on this limitation; Tobias's off-state power opinions admissible |
Key Cases Cited
- Celotex Corp. v. Catrett, 477 U.S. 317 (summary judgment standard)
- Anderson v. Liberty Lobby, 477 U.S. 242 (genuine-issue and materiality standard)
- Matsushita Elec. Indus. Co. v. Zenith Radio Corp., 475 U.S. 574 (summary judgment and burden)
- Markman v. Westview Instruments, 52 F.3d 967 (claim construction framework)
- Daubert v. Merrell Dow Pharms., 509 U.S. 579 (expert admissibility gatekeeping)
- Kumho Tire Co. v. Carmichael, 526 U.S. 137 (Daubert applies to technical experts)
- Novartis Corp. v. Ben Venue Labs., 271 F.3d 1043 (accused infringer’s summary judgment paths)
- Laitram Corp. v. Rexnord, 939 F.2d 1533 (absence of one claim element defeats infringement)
- Brilliant Instruments, Inc. v. GuideTech, 707 F.3d 1342 (doctrine of equivalents analysis)
- Ellis v. Costco Wholesale Corp., 657 F.3d 970 (district court’s discretion in assessing expert reliability)