Patent ID: 8523544

Claim:
A three stage vacuum device producing a vacuum of approximately two milli-torr comprising: a first stage having a first fixed scroll and a first orbiting scroll, said first fixed scroll communicating to a space selected for evacuation, said first orbiting scroll having an inner face and an opposite outer face, said outer face of said first orbiting scroll meshing with said first fixed scroll; a second stage adjacent to said first stage inwardly, said second stage in gaseous communication to said first stage, said second stage having a second fixed scroll, said second fixed scroll meshing with said inner face of said first orbiting scroll; a third stage spaced inwardly of said second stage, said third stage in gaseous communication to said second stage, said third stage having a third fixed scroll and a second orbiting scroll, said second orbiting scroll meshing with said third fixed scroll; a driving pin journaled to said second orbiting scroll opposite said third fixed scroll; a motor operatively connected to said driving pin, said motor imparting rotation to said driving pin, said motor being generally opposite said first fixed scroll and outwardly of said second orbiting: scroll; and, said motor rotating said first orbiting scroll and said second orbiting scroll simultaneously thus evacuating gas molecules from the selected space.