Ion exchange process for separating proteins

Claim 1

IN A PROCESS OF SEPARATING A PROTEIN FROM OTHER PROTEINS IN AN AQUEOUS SOLUTION CONTAINING A PLURALITY OF PROTEINS AS SOLUTES AND ALSO HAVING A SALT CONTENT PRESENT AS CATIONS AND ANIONS IN A CONCENTRATION RENDERING SAID FIRST-MENTIONED PROTEIN SOLUBLE IN SAID SOLUTION THEREIN AND IN THE ABSENCE OF WHICH CATIONS AND ANIONS SAID PROTEIN IS INSOLUBLE IN SAID SOLUTION, ANOTHER PROTEIN SOLUTE OF SAID SOLUTION BEING SOLUBLE THEREIN IN THE ABSENCE OF SAID CATIONS AND ANIONS IN SAID CONCENTRATION, THE STEPS OF PROVIDING A MIXTURE OF CATION-EXCHANGE AND ANION-EXCHANGE RESINS CONDITIONED TO BE IN EQUILIBRIUM WITH AN ION CONCENTRATION AT WHICH SAID SOLUTION-CONTAINED CATIONS AND ANIONS ARE REMOVED FROM SAID SOLUTION, PASSING SAID AQUEOUS SOLUTION OF SAID PROTEINS AND SALT SOLUTE IN CONTACT WITH SAID CATIONEXCHANGE RESIN AND SAID ANION-EXCHANGE RESIN ADJUSTING THE PH OF THE SOLUTION TO SUBSTANTIALLY NEUTRAL IN THE RANGE 6 TO 8 BETWEEN ALKALINITY AND ACIDITY BY ION-EXCHANGE BETWEEN SAID SOLUTION AND SAID RESINS, REMOVING FROM SAID SOLUTION SAID SOLUBILIZING CATIONS BY ION EXCHANGE WITH SAID CATION-EXCHANGE RESIN TO REDUCE SAID SOLUBILIZING CATIONS AND REMOVING FROM SAID SOLUTION SAID SOLUBILIZING ANIONS BY ION EXCHANGE WITH SAID ANION-EXCHANGE RESIN TO REDUCE SAID SOLUBILIZING ANIONS, AND THEREBY PRECIPITATING SAID FIRST-MENTIONED PROTEIN FROM SAID SOLUTION OF PROTEINS, AND SEPARATING SAID PRECIPITATE FROM SAID SOLUTION.