Thank Heavens

We can really be grateful that this priceless patent has passed, after its 20 years--into the public domain!

http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=/netahtml/srchnum.htm&r=1&f=G&l=50&s1=4,022,227.WKU.&OS=PN/4,022,227&RS=PN/4,022,227