A character compression-decompression method for printers in which dots are added before compression of a character so as to generate a character in which the same dot pattern continues. The character is compressed and then is stored in a character geernator. Upon printing the character, the compressed...http://www.google.co.uk/patents/US5199803?utm_source=gb-gplus-sharePatent US5199803 - Method of compressing and expanding dot-matrix character
