Compensating pressure controller for fluid dispenser and method
US8365952B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 13, 2012 |
| Grant date | Feb 5, 2013 |
| Priority date | — |
| Expiry date | Mar 13, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05D16/2053
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A fluid dispensing system having a fluid dispenser supporting a barrel containing liquid to be dispensed. The barrel has a slidable piston therein with the liquid on a forward piston side and a chamber on a rear piston side. Positive and negative pressure fluid circuits have components operable to apply respective positive and negative fluid pressures to the rear side of the piston. A pressure transducer is operable to sense a fluid pressure in the chamber; and a dispenser control is operative to store a pressure-time relationship during an initial dispensing cycle and thereafter, operate a component in the positive pressure fluid circuit to maintain the pressure-time relationship during a subsequent dispensing cycle.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.