Patent ID: 8087429
Filing Date: 2012-01-03
Classification: F04B,Y10T

Abstract:
1. A multi-stage pump configured to dispense photoresist chemicals comprising: a pump inlet flow path; a pump outlet flow path; a feed pump in fluid communication with the pump inlet flow path comprising: a feed stage outlet flow path in fluid communication with the feed chamber; a dispense stage inlet flow path in fluid communication with a dispense chamber; a filter in fluid communication with the feed stage outlet flow path and the dispense stage inlet flow path such that fluid flowing from the feed pump to a dispense pump passes through the filter; the dispense pump in fluid communication with the feed pump and the pump outlet flow path, the dispense pump comprising: a dispense block formed of a single piece of material defining at least a portion of the feed chamber and at least a portion of the dispense chamber; and a set of valves to selectively allow fluid flow through the multi-stage pump.