Liquid material dispenser
US5246147A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 13, 1992 |
| Grant date | Sep 21, 1993 |
| Priority date | — |
| Expiry date | Jul 13, 2012 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB05B11/027
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A liquid material dispenser includes a housing formed with a reservoir for the liquid to be dispensed, an outlet through which the liquid is to be dispensed, and a connecting passageway between the reservoir and the outlet. A diaphgram is located in a cavity in the passageway such that one side of the diaphragm defines a pumping chamber, and the other side defines a control chamber. An electrolytic cell generates a gas to the control chamber according to the quantity of electrical current passed through the electrolyte, for driving the diaphragm through forward strokes to pump liquid to the outlet; and a slow-acting vent vents the gas from the control chamber to the atmosphere at a rate lower than that of generation of gas by the electrolytic cell, for driving the diaphragm through return strokes to refill the pumping chamber.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.