A method for controlling a liquid volume flowing onto a reactive surface which includes a sample application port, two systems of capillary channels, a reaction chamber, and an overflow chamber. The liquid sample to be analyzed is applied to the sample application port which gives the liquid entry to...http://www.google.com.tw/patents/US4761381?utm_source=gb-gplus-share專利 US4761381 - Volume metering capillary gap device for applying a liquid sample onto a reactive surface
