US Patent 4,558,302

Number:	4,558,302
Title:	High speed data compression and decompression apparatus and method
Filed:	20-Jun-1983
Granted:	10-Dec-1985
Re-examined:	14-Dec-1992
Re-granted:	01-Apr-1994
Inventor:	Welch
Assignee:	Sperry Corporation (now Unisys)

Comment by FAQ:The text for the original patent can be ftped from ftp://ftp.uni-stuttgart.de/pub/doc/comp-patents/US4558302.Z. There is also a European Patent 0,129,439 1/2/89 for DE, FR, GB, IT and patent pending for Japan.