Assembly and method of obtaining a controlled gas mixture
US3939858A · kind A · utility
13Cited by
6References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 13, 1974 |
| Grant date | Feb 24, 1976 |
| Priority date | — |
| Expiry date | Sep 13, 1994 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S261/17
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
Apparatus and method for obtaining a controlled gas mixture of predetermined proportionality using a temperature dependent permeation tube or like source for the addition of a small amount of a constituent gas in a higher flow rate carrier gas. A thermistor having a negative coefficient of resistance is associated with the permeation source and electrically connected to a flow controller for the carrier gas to automatically regulate the flow rate of the carrier gas in accordance with temperature variation of the permeation source.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.