Grace Instrument Revives Patent Row Over Oil Drilling Viscometer

Grace Instrument Industries LLC on Thursday revived a part of its lawsuit accusing Chandler Devices Co. LLC of infringing a patent for a excessive stress viscometer utilized in drilling oil wells.

The time period “enlarged chamber” in Grace’s patent could be understood by a talented artisan to imply massive sufficient to perform a specific operate, not bigger than some undefined baseline object, the US Court docket of Appeals for the Federal Circuit dominated.

• The district choose wrongly relied on dictionary definitions as a substitute of what a talented artisan would perceive from studying the file, the appeals courtroom mentioned
• The appeals courtroom rejected Grace’s …