Patent · US Expired

Recovery of silver from photographic films by high shear conditions

US4612057A · kind A · utility

21Cited by

7References

6Claims

0Family size

Assignee

E.I. DU PONT DE NEMOURS AND COMPANY · US

Inventors

Kenneth R. Buser · Wilmington, US
Thomas Rettig · Rheda-Wiedenbrück, DE

Key dates

Filing date	Jan 22, 1985
Grant date	Sep 16, 1986
Priority date	—
Expiry date	Jan 22, 2005

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02P10/20
WIPO fieldMaterials, metallurgy
WIPO sectorChemistry

Abstract

A method for the recovery of silver from photographic film having a polyester base and a macromolecular organic polymer coating to which is adhered a light sensitive silver emulsion layer. The process includes mixing small film pieces in a hot aqueous liquid having a solids concentration level of at least 25 percent by volume. The mixture is subjected to conditions of high shear to remove the silver emulsion. The liquid containing the silver emulsion is then separated from the film pieces and the silver is recovered from the liquid.

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