Patent Reviews: 5,668,633; 5,677,967; 5,768,028; 5,768,454; 5,777,770; 5,784,200; 5,787,102; 5,787,213; 5,795,681; 5,796,511; 5,796,512; 5,798,850; 5,801,880; 5,801,889; 5,804,813