| Patent Number |
Title Of Patent |
Date Issued |
| 5178746 |
Method for purification of trivalent chromium electroplating baths |
January 12, 1993 |
| A new method for purification of trivalent chromium electroplating baths contaminated with cationic metal ions is disclosed. In this purification process, the contaminated trivalent chromium is passed at the pH level of the bath through one or more columns containing an ion-exchange resi |
| 5176886 |
Rapid, ambient-temperature process for stripping gold bound to activated carbon |
January 5, 1993 |
| An improved process for stripping gold cyanide from activated carbon is disclosed. The process involves contact of gold-laden activated carbon with a strong base at ambient temperatures followed by elution with an aqueous solution containing an organic solvent, preferably aqueous ace |
| 5108615 |
Method for recovery of a metal ion from electroless plating solutions |
April 28, 1992 |
| A new process for removal of a metal ion from an anionic complex, including a first chelating agent and a metal ion, such as copper, nickel or cobalt ion, in electroless plating bath rinse streams utilizes a cation exchange resin to extract the metal ion from the rinse stream after the m |
| 5055402 |
Removal of metal ions with immobilized metal ion-binding microorganisms |
October 8, 1991 |
| A composition for removing metal ions from aqueous solution is prepared by immobilizing metal ion-binding microorganisms such as algae, washing the immobilized microorganisms, drying the washed immobilized microorganisms and heating the dried immobilized microorganisms to a temperature o |
| 4992207 |
Composition for extraction of metal ions and oxanions |
February 12, 1991 |
| The present invention relates to a method for the selective extraction of the metals gold, silver, platinum or mercury ions or colloidal gold, from an aqueous solution containing at least one of these metal ions which comprises contacting the solution, at a pH of 2 or less, with cells or |
| 4908676 |
Sensors for dissolved substances in fluids |
March 13, 1990 |
| The present invention comprises a simple multi-purpose on-line system for monitoring the concentration and/or the total amount of an organic analyte species or inorganic analyte species in an aqueous solution. The on-line detection system comprises a detection column and a sensor mounted |
