A dispenser for attachment to a container containing a fluid material, including an actuator which keeps the container in a substantially constantly open configuration so as to allow the fluid to pass into the dispenser, and a controllable outlet, through which a portion of the fluid is emitted from...http://www.google.com.hk/patents/US6540155?utm_source=gb-gplus-share專利 US6540155 - Automatic spray dispenser
