Liquid flow controller and precision dispense apparatus and system
US8082946B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 20, 2009 |
| Grant date | Dec 27, 2011 |
| Priority date | — |
| Expiry date | Jan 1, 2030 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/7761
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
Fluid control apparatus including a proportional flow valve having a fluid inlet and a fluid outlet; a pneumatic proportional control valve in communication with the proportional flow valve for modulating the proportional flow valve; a frictional flow element having a frictional flow element fluid inlet in fluid communication with the fluid outlet of the proportional flow valve and having a frictional flow element fluid outlet spaced from the frictional flow element fluid inlet, an upstream pressure sensor; a downstream pressure sensor; and a controller in communication with the upstream pressure sensor, the downstream pressure sensor and the pneumatic proportional control valve.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.