Apparatus for the production of particular concentrations of gaseous materials as well as for mixing various gaseous materials in a specified ratio
US4938256A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 7, 1989 |
| Grant date | Jul 3, 1990 |
| Priority date | — |
| Expiry date | Feb 7, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/87692
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
An apparatus for the producton of particular concentrations of gaseous materials as well as for mixing different gaseous materials in a specified ratio in which the gaseous materials are supplied from different sources in pulsed fashion to at least one common outlet. The gaseous materials are passed through a valve which has n inlets and m outlets, n and m being whole numbers. This valve can connect at least one inlet for a specifiable time with a particular outlet. The valves are controlled preferably by a pulse-width modulated method, for example by means of a microprocessor. A gas pump is connected downstream from the common outlet.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.