US Patent 5,016,009

Number:	5,016,009
Title:	Data compression apparatus and method
Filed:	13-Jan-1989
Granted:	14-May-1991
Inventors:	George Glen A, Ivey Glen E, Whiting Douglas L
Assignee:	Stac Inc

Comment by FAQ:LZ77 with offset hash table (extended in US patent 5,126,739).