Apparatus for electro-chemical etching

Claim 1

IN A DEVICE FOR USE WITH ELECTRO-CHEMICAL ETCHING APPARATUS HAVING AN ELECTRICALLY CONDUCTIVE HORIZONTAL SURFACE UPON WHICH SAID DEVICE IS ADAPTED TO REST, IN COMBINATION, A RIGID NON-CORROSIVE INSULATING BASE MEMBER, AN ELECTRICALLY CONDUCTIVE NON-CORROSIVE MEMBER HAVING A FLAT UPPER SURFACE AND SUPPORTED ON SAID BASE MEMBER, AN ABSORBENT MEMBRANE DISPOSED ON THE FLAT UPPER SURFACE OF SAID ELECTRICALLY CONDUCTIVE NON-CORROSIVE MEMBER AND EXTENDING AROUND THE EDGES THEREOF, A FORCE-FITTED BAND EXTENDING AROUND THE EDGES OF SAID ELECTRICALLY CONDUCTIVE NON-CORROSIVE MEMBER FOR SECURING SAID MEMBRANE TO SAID ELECTRICALLY CONDUCTIVE NON-CORROSIVE MEMBER, AND A PLURALITY OF ELECTRICALLY CONDUCTIVE FASTENING DEVICES EXTENDING THROUGH SAID INSULATING BASE MEMBER AND INTO SAID ELECTRICALLY CONDUCTIVE NON-CORROSIVE MEMBER TO MECHANICALLY SECURE THE LATTER TO THE FORMER, SAID FASTENING DEVICES ADAPTED TO REST UPON THE ELECTRICALLY CONDUCTIVE HORIZONTAL SURFACE OF SAID ETCHING APPARATUS AND TO ESTABLISH ELECTRICAL CONNECTION BETWEEN SAID HORIZONTAL SURFACE AND SAID ELECTRICALLY CONDUCTIVE NON-CORROSIVE MEMBER.