Patent · US Expired

Metering device

US4447400A · kind A · utility

3Cited by

4References

6Claims

0Family size

Assignee

Hoechst GmbH · DE

Inventors

Hans-Werner Stephan · Cologne, DE
Hermann Klein · Trossingen, DE
Klaus Lehr · Hürth, DE

Key dates

Filing date	Mar 29, 1982
Grant date	May 8, 1984
Priority date	—
Expiry date	Mar 29, 2002

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB02C23/02
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

A device for metering liquid yellow phosphorus into a rotating ball mill for the production of red phosphorus therein includes a stationary outer tubular structure surrounding an inner tubular structure rotatably mounted therein. A valve having a valve rod associated with it is installed within the inner tubular structure near its end close to the ball mill. A plug provided with a central bore receiving the valve rod is installed within the inner tubular structure near its end remote from the ball mill. A bellows surrounds a portion of the valve rod inside the inner tubular structure, the bellows being tightly connected to the plug and valve rod.

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