Cisco Systems, Inc. v. Cirrex Systems, LLC

Claims in patent relating to fiber optic communication signals were unpatentable for lack of written description support. Cirrex’s 082 patent is directed to the field of fiber optic communication signals that use light energy made up of multiple different wavelengths within one fiber optic cable. Cisco requested inter partes reexamination of the patent. The Patent and Trademark Office found certain claims patentable and rejected other claims for lack of written description support. The Board affirmed. The Federal Circuit affirmed in part and reversed in part, finding that, under the correct claim construction for the equalization and discrete attenuation claims, all the claims on appeal unpatentable for lack of written description support. View "Cisco Systems, Inc. v. Cirrex Systems, LLC" on Justia Law