In times past, they were very useful.  You invented something, staked your
claim, made a living off it.  It was pretty easy to show that you had some
unique device and you thought of it, and you deserved the chance to make a
living from your cleverness without interference from others.
    Today, most "inventions" are rarely unique, new, or innovative.  And so many
things have been invented that most anyone can find something to sue you over.
They will not always win, but you can be bankrupted in the defense of your
patent in any case.  My feeling is that you are better off copyrighting what you
can, selling the hell out of it fast, and getting out.

Cheers!

Chip Shults
My robotics, space and CGI web page - http://home.cfl.rr.com/aichip

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