Patent · US Expired

Adsorbents composed of inorganic oxides modified with organic dyes

US5484454A · kind A · utility

2Cited by

5References

4Claims

0Family size

Assignee

Engelhard Process Chemicals GmbH · DE

Inventors

Kirsten Furhmann · Hannover, DE
Alf-Eric Wischnat · Lehrte, DE
Thomas Schulz · Bad Pyrmont, DE
Michael Hoffmeister · Laatzen, DE

Key dates

Filing date	Oct 5, 1994
Grant date	Jan 16, 1996
Priority date	—
Expiry date	Oct 5, 2014

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/2993
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

Particulate adsorbents composed of inorganic oxides impregnated with an indicator dye selected from the group consisting of phenolphthalein, cresol red and thymol blue; a method for the production thereof, and a method for adsorptive drying of neutral gases using the aforementioned particulate adsorbents, whereby the degree of water absorption by the adsorbent particles is indicated by a reversible color change.

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