Michael J Vidal

US Patent:

8136707, Mar 20, 2012

Filed:

Apr 3, 2006

Appl. No.:

11/278465

Inventors:

Michael A. Vidal - North Attleboro MA, US

Assignee:

Nordson Corporation - Westlake OH

International Classification:

B67D 7/08

US Classification:

222639, 222 55, 222 61, 222389

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 a first dispensing cycle and thereafter, operate a component in the positive pressure fluid circuit to maintain the pressure-time relationship during a subsequent dispensing cycle.

US Patent:

8365952, Feb 5, 2013

Filed:

Mar 13, 2012

Appl. No.:

13/418601

Inventors:

Michael A. Vidal - North Attleboro MA, US

Assignee:

Nordson Corporation - Westlake OH

International Classification:

G01F 11/04

US Classification:

222 1, 222 55, 222639

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.