Wet-roasting of green coffee

Claim 1

IN A PROCESS OF PREPARING A COFFEE EXTRACT SUITABLE FOR USE IN THE MANUFACTURE OF A SOLID SOLUBLE COFFEE PREPARATION, IN WHICH PROCESS UNROASTED COFFEE IS HEATED WITH WATER IN A PRESSURE VESSEL AT A TEMPERATURE ABOVE 300*F., THE IMPROVEMENT WHICH COMPRISES: SUSPENDING COMMINUTED UNROASTED COFFEE IN WATER IN A CLOSED PRESSURE VESSEL, HEATING THE CONTENTS OF THE VESSEL TO A TEMPERATURE IN THE RANGE 375*-450*F., CONTINUING THE HEATING IN THIS RANGE UNTIL A SUDDEN RISE OF PRESSURE OF THE ORDER OF 75-150 POUNDS PER SQUARE INCH, GAGE, OCCURS, AND SEPARATING THE AQUEOUS EXTRACT FROM THE GROUNDS.