How long to patents last? It patent for the D port was granted in 1981. I tried posting a link to it but that didn't work. Cut and past the link at the end of this post.
-Chris
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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=4,302,935.WKU.&OS=PN/4,302,935&RS=PN/4,302,935
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