:-)

[link|http://patft.uspto.gov/netacgi/nph-Parser?u=%2Fnetahtml%2Fsrchnum.htm&Sect1=PTO1&Sect2=HITOFF&p=1&r=1&l=50&f=G&d=PALL&s1=4085827.PN.&OS=PN/4085827&RS=PN/4085827|US Patent #4085827].

Cheers,
Scott.