Patent Reviews: 5,083,219; 5,153,670; 5,162,872; 5,260,814; 5,262,879; 5,267,063; 5,270,791; 5,280,788; 5,288,996; 5,289,299; 5,291,316; 5,293,873; 5,294,806; 5,295,208; 5,296,972; 5,297,436; 5,303,021; 5,305,083; 5,305,124; 5,305,138