Patent ID: 11964277
Assignee: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.
Field: Chemical engineering (Chemistry)
Classification: CPC B | IPC A  B  C  G

Claim 4:
5. A metered volume microfluidic device, comprising fluid flow microfluidics, the fluid flow microfluidics including:
an inflow channel,
a metered volume chamber positioned to receive working fluid from the inflow channel,
a metered volume outflow channel positioned to receive and direct a metered volume of the working fluid when discharged from the metered volume chamber, and
a capillary check valve to allow excess working fluid to exit the metered volume chamber when filling the metered volume chamber via the inflow channel, the capillary check valve to prevent excess working fluid that has passed there through from being reintroduced into the metered volume chamber when the working fluid is discharged into the metered volume outflow channel, wherein the capillary check valve is configured to allow a liquid-gas interface to form therein with the gas introduced from an overflow chamber and the liquid introduced from the metered volume chamber, but under conditions used to discharge the metered volume channel into the metered volume outflow channel, the liquid-gas interface remains within the capillary check valve.