Patent US 5,954,437

A computer keyboard consists of keys which are arranged in groups according to five different patterns for enhancing the key-in efficiency. The first and the second patterns are respectively composed of four sets of specific keys which are arranged in group and covered with four different colors. The third and fourth patterns consist respectively of five sets of specific keys which are grouped and covered with five different colors. The fifth pattern consists of seven sets of specific keys which are grouped and covered with seven different colors.