395 F.Supp.3d 1243
N.D. Cal.2019Background
- Primus sued for declaratory judgment of invalidity/noninfringement of two IEH patents (U.S. Pat. Nos. 8,822,143 and 9,637,771) that claim a multi-step pooled microbial testing protocol; IEH counterclaimed for infringement.
- The claimed method: (A) collect multiple independent samples from multiple non-contiguous lots; (B) dry-composite per-lot; (C) enrich each composited lot sample; (D) remove portions of each enriched lot sample and wet-composite those portions into a pooled modular composite; (E) test pooled sample — if negative, validate all lots; if positive, test individual enriched lot composites to identify positives and validate negatives.
- Primus moved for summary judgment arguing obviousness based on prior art references (Davies, Siragusa, Gombas, Silliker, Price, Jarvis). IEH moved for partial summary judgment on infringement.
- Disputes of fact existed about (i) what each prior-art reference actually teaches (scope/content), (ii) whether a person of ordinary skill in the art (POSITA) would have been motivated to combine the references, (iii) the predictability of combining pooling/enrichment across different food matrices, and (iv) expert admissibility/qualified topics.
- The court denied Primus’s summary judgment of invalidity (obviousness) because material factual disputes existed (scope of prior art, POSITA level, unpredictability/dilution concerns).
- The court granted IEH’s partial summary judgment: Primus’s pooled testing practices infringe the asserted claims for 99.99% of applications (the court rejected Primus’s argument that its rarely‑used “error protocol” avoids infringement).
Issues
| Issue | Plaintiff's Argument (Primus) | Defendant's Argument (IEH) | Held |
|---|---|---|---|
| Obviousness of patents | Prior art individually and in combination (Davies/Siragusa + Gombas, plus Silliker/Price/Jarvis) teaches each claimed step; claims would be obvious to a POSITA | Prior art does not teach claimed combinations (scope mischaracterized); combining references is unpredictable due to dilution and differing food matrices; secondary considerations support nonobviousness | Denied Primus’s SJ — material factual disputes (scope, POSITA, predictability/motivation to combine) precluded summary judgment of obviousness |
| Admissibility/scope of IEH expert (Dr. Applegate) | Primus challenged Applegate’s qualifications on compositing and some industry-economic topics | IEH showed Applegate is qualified on food testing; court limited topics he may not testify about (e.g., market supply/demand, long‑felt need) | Court admitted Applegate’s relevant opinions for summary judgment purposes but excluded testimony on some topics he conceded lack of expertise |
| Infringement (IEH’s partial SJ) | Primus contended its protocol does not perform claim step E(2) as written because its confirmation/error protocol prevents validation in some cases | IEH argued claims use “comprising” and allow additional steps/confirmation; Primus’s error path is rare (0.01%) and claims cover methods that include extra steps | Granted IEH’s partial SJ — Primus practices the claimed method in 99.99% of instances and the asserted claim language and dependent claims permit additional confirmation steps |
| Motions to seal | Both parties sought sealing of various business, protocol, and customer materials under protective designations | Court balanced public access vs. competitive harm; required narrow tailoring and specific factual showings | Several narrow sealing requests granted (pricing/customer identities/trade‑secret SOPs where shown); multiple other sealing requests denied and documents ordered unsealed or refiling narrowed |
Key Cases Cited
- Anderson v. Liberty Lobby, 477 U.S. 242 (establishes genuine‑issue standard for summary judgment)
- Celotex Corp. v. Catrett, 477 U.S. 317 (party moving for summary judgment bears initial burden to show absence of genuine dispute)
- KSR Int’l Co. v. Teleflex Inc., 550 U.S. 398 (obviousness framework; avoid hindsight; motivation to combine)
- Graham v. John Deere Co. of Kansas City, 383 U.S. 1 (Graham factors for obviousness)
- Kamakana v. City & Cty. of Honolulu, 447 F.3d 1172 (compelling‑reasons standard to seal materials attached to dispositive motions)
- Ortho‑McNeil Pharm., Inc. v. Mylan Labs., Inc., 520 F.3d 1358 (use of dependent claims to inform claim construction)
- UltimatePointer, L.L.C. v. Nintendo Co., 816 F.3d 816 (distinguishing situations where an accused product can never meet a claim vs. sometimes‑practiced methods)