Patent Reviews: 4,844,603; 4,886,334; 4,869,110; 4,859,014; 4,875,774; 4,875,770; 4,881,790; 4,893,924; 4,869,569; 4,887,879; 4,890,895; 4,892,374; 4,893,923; 4,895,422; 4,896,327; 4,899,346