617 F. App'x 989
Fed. Cir.2015Background
- Cambrian Science sued Cox for infringement of claims 57 and 58 of U.S. Patent No. 6,775,312, alleging Cox’s Generation 2 photonic integrated circuit (Gen 2) practices an "active waveguide coupler."
- Claim 57 requires: a laser array; an "active waveguide coupler" receiving the laser outputs; and a non-orthogonal orientation relative to the semiconductor cleavage plane.
- The district court construed "active waveguide coupler" to mean a component that (1) forms part of the optical path and combines light from multiple sources, and (2) is made of material "in which the absorption of an optical signal can be changed to gain by application of pumping."
- On summary judgment the district court held Gen 2 does not infringe because its coupler is passive (incapable of being pumped to provide gain); Cambrian’s Rule 56(d) request for additional discovery was denied.
- The Federal Circuit affirmed, concluding the intrinsic record supports the district court’s construction of "active" and that Cambrian failed to raise a genuine dispute for literal infringement or under the doctrine of equivalents.
Issues
| Issue | Plaintiff's Argument (Cambrian) | Defendant's Argument (Cox) | Held |
|---|---|---|---|
| Proper construction of "active waveguide coupler" | Term should not import specification language about pumping/gain; "active" need not require capability to provide gain | "Active" means material capable of being pumped to produce gain; specification defines "active" vs "passive" | Court adopted district court construction: "active" requires material capable of being pumped to change absorption to gain |
| Literal infringement by Gen 2 | Gen 2 coupler or coupler+attached amplifier should be treated as meeting the "active" limitation; some regions might be active | Gen 2 coupler is passive and incapable of being pumped; the claim requires the coupler itself to be active | No literal infringement: Gen 2 lacks an "active waveguide coupler" as construed |
| Doctrine of equivalents | Even if not literal, differences are insubstantial and equivalents apply | Expert testimony was conclusory and unsupported; cannot create a genuine issue | Doctrine of equivalents fails for lack of particularized factual/linking evidence |
| Denial of Rule 56(d) continuance for additional discovery | Cambrian argued more discovery could create factual disputes | District court found lack of diligence in seeking discovery; summary judgment appropriate | Denial upheld as non-prejudicial in light of undisputed intrinsic and expert testimony supporting noninfringement |
Key Cases Cited
- Teva Pharm. USA, Inc. v. Sandoz, 135 S. Ct. 831 (2015) (standard of review for claim construction: subsidiary factual findings reviewed for clear error)
- Phillips v. AWH Corp., 415 F.3d 1303 (Fed. Cir. 2005) (claims read in light of the specification; person of ordinary skill standard)
- Warner-Jenkinson Co. v. Hilton Davis Chem. Co., 520 U.S. 17 (1997) (doctrine of equivalents framework)
- Digital Biometrics, Inc. v. Identix, Inc., 149 F.3d 1335 (Fed. Cir. 1998) (claim language controls construction)