Oh an one more thing according to USPTO USVO filed first by a few days haha see:
Acacia Patent 5,132,992
says: July 21, 1992
http://patft.uspto.gov/netacgi/nph-P...S=PN/5,132,992
USVO says: Patent 5,130,792 July 14, 1992
http://patft.uspto.gov/netacgi/nph-P...&RS=PN/5130792
and they filed a year before acacia did.