Patent · US Expired

Fluid dispenser

US4944430A · kind A · utility

24Cited by

5References

32Claims

0Family size

Assignee

Ing. Erich Pfeiffer GmbH & Co KG · DE

Inventors

Lothar Graf · Rielasingen-Worblingen, DE
Leo Maerte · Sipplingen, DE
Thomas Skorka · Radolfzell, DE

Key dates

Filing date	Aug 7, 1987
Grant date	Jul 31, 1990
Priority date	—
Expiry date	Aug 7, 2007

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB05B11/1077
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

A vacuum-tight and pressure-tight closed storage space in a container is constructionally combined with a thrust piston pump projecting thereinto and a drag piston slidably guided therein and in the initial position of the thrust piston pump is hermetically sealed by an exhaust valve mechanically closed in forcibly controlled manner. The drag piston is adapted to the thrust piston pump in such a way that the storage space can be emptied substantially free with the thrust piston pump.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.