Patent · US Expired

Crystalline silicas

US4781906A · kind A · utility

7Cited by

2References

5Claims

0Family size

Assignee

Labofina, S.A. · BE

Inventors

Raymond M. Cahen · Brussels, BE
Guy Debras · Les Bons Villers, BE
Georges E. M. J. DeClippeleir · Sint-Pieters-Leeuw, BE

Key dates

Filing date	Dec 19, 1983
Grant date	Nov 1, 1988
Priority date	—
Expiry date	Dec 19, 2003

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C2529/035
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

A novel crystalline silica composition having a silica to alumina atomic ratio not lower than 80 and having a certain specific X-ray diffraction pattern after calcination in air for at least 3 hours at a temperature of at least 500.degree. C.

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