Nortek Air Solutions, LLC fka CES Group, LLC v. Energy Labs, Inc
5:14-cv-02919
N.D. Cal.Jul 15, 2016Background
- Nortek sued Energy Labs (Energy Labs Inc., DMG Corp., DMG North) alleging infringement of seven HVAC-related patents (the Asserted Patents). The order resolves multiple motions in limine prior to trial.
- Major contested topics: adequacy of Energy Labs’ invalidity disclosures (prior art, anticipation, obviousness combinations), number of invalidity grounds, exclusion of certain Nortek business/acquisition evidence, timeliness of witness disclosures, and admissibility of Nortek’s damages expert opinions (price-erosion and reasonable royalty).
- Nortek had stipulated during discovery that Energy Labs’ invalidity contentions were adequate, which the court treated as resolving certain disclosure disputes.
- The court found two Energy Labs witness disclosures (Forman, Brune) untimely and excluded them; other potential witness testimony (Susan Snyder) was deferred pending notice.
- The court admitted price-erosion evidence and expert testimony on that topic (subject to cross-examination), but excluded Nortek’s expert reasonable-royalty opinion for failing to apportion the value of patented features from unpatented components.
- The court generally denied motions that sought wholesale exclusion of obviousness and copying evidence, emphasizing cross-examination and adherence to expert-report scope as the means to test reliability.
Issues
| Issue | Plaintiff's Argument | Defendant's Argument | Held |
|---|---|---|---|
| Adequacy of invalidity disclosures (prior art, obviousness combinations) | Nortek: Energy Labs failed to properly disclose CleanPak and single-reference anticipation/obviousness under Rule 26 and Patent Local Rules. | Energy Labs: Disclosures (invalidity contentions and expert reports) were sufficient; Nortek previously stipulated adequacy and waited too long to object. | Denied (for Nortek). Court relied on Nortek’s prior stipulation and found no prejudice; obviousness disputes are for cross-examination. |
| Number and specificity of invalidity grounds | Nortek: Limit Energy Labs to four invalidity grounds per asserted claim for manageability and fairness. | Energy Labs: Five combinations per claim (total ~40) is reasonable; Rambus supports ~5 per claim. | Denied. Court required Energy Labs to clarify grounds; allowed current list (≈5 per claim) but enforced trial time limits rather than further reductions. |
| Exclusion of acquisition evidence and untimely witnesses | Nortek: Exclude evidence of Nortek’s efforts to acquire Energy Labs as irrelevant/prejudicial; also exclude untimely witness disclosures (Forman, Brune, Snyder). | Energy Labs: Acquisition efforts relevant to damages, price erosion, and rebuttal of copying; witnesses were disclosed and relevant. | Acquisition evidence denied (i.e., not excluded) — allowed with possible limiting instruction. Witnesses Forman and Brune excluded as untimely; Snyder deferred — party must give advance notice before calling her. |
| Admissibility of Nortek’s damages expert opinions (price erosion and reasonable royalty) | Nortek: Dr. Prowse relied on Panduit factors and business records; price-erosion and spreadsheet summaries are admissible; entire-system royalty appropriate because claims cover air-handling units. | Energy Labs: Dr. Prowse failed to show causation for price erosion and failed to apportion patented value from unpatented features; spreadsheets are hearsay/improper. | Mixed: Price-erosion testimony and spreadsheet summaries admitted (weight for cross-exam). Dr. Prowse’s reasonable-royalty opinion excluded for failing to apportion patented vs. unpatented value (entire-market-value misuse). |
Key Cases Cited
- Meyer Intellectual Props. Ltd. v. Bodum, Inc., 690 F.3d 1354 (Fed. Cir. 2012) (Rule 26 expert disclosure purpose: enable opponent to rebut and cross-examine).
- LaserDynamics, Inc. v. Quanta Computer, Inc., 694 F.3d 51 (Fed. Cir. 2012) (cannot show feature is "demand-driving" merely by showing it is valuable or essential to use).
- VirnetX, Inc. v. Cisco Sys., Inc., 767 F.3d 1308 (Fed. Cir. 2014) (smallest-saleable-unit rule requires further apportionment when unit contains non-infringing components).
- Uniloc USA, Inc. v. Microsoft Corp., 632 F.3d 1292 (Fed. Cir. 2011) (comparable license alone cannot justify using entire-market-value without evidence the patented feature drives demand).