US Patent 4,597,057

Number:	x,xxx,xxx
Title:	System for compressed storate of 8-bit ascii bytes using coded strings of 4-bit nibbles.
Filed:	31-Dec-1981
Granted:	24-Jun-1986
Inventor:	Snow
Assignee:	System Development corporation

Comment by FAQ:Compression using static dictionary of common words, prefixes and suffixes.