ALEXANDRIA, Va., Aug. 18 -- United States Patent no. 12,709,784, issued on Aug. 18, was assigned to Greensource Fabrication LLC (Charlestown, N.H.).
"Solvent free copper extraction" was invented by Derek Lovejoy (Milford, N.H.).
According to the abstract* released by the U.S. Patent & Trademark Office: "The system and method described herein provides a system and method for using ion-exchange resins to remove excess copper during processes such as PCB (Printed Circuit Board) fabrication using cupric chloride etchants. Cu+2 is used to oxidize solid copper producing two Cu+ ions. During operation, the etchant is overloaded with copper ions and an extraction system is implemented to control the concentration and remove excess copper. Traditi...