The present invention prevents liquid leakage regardless of the using conditions and the reserving atmosphere and stabilizes a negative pressure regardless of the degree of liquid consumption, by having a one-way valve in the liquid container that supplies liquid to an external device, maintaining the...http://www.google.com/patents/US6854836?utm_source=gb-gplus-sharePatent US6854836 - Liquid container, liquid supply system, liquid using apparatus, ink tank, ink supply system, inkjet print head and print apparatus
