A reducing agent metering system for delivering reducing agent to a lean burn internal combustion engine. The reducing agent metering system includes a metering system housing, a system for metering vaporized reducing agent to the internal combustion engine, the system positioned within the metering...http://www.google.com.au/patents/US7644577?utm_source=gb-gplus-sharePatent US7644577 - Reducing agent metering system for reducing NOx in lean burn internal combustion engines
