<http://press.redhat.com/2009/04/29/fighting-bad-patents-with-good-prior-art/>

For a successful patent challenge, one must establish that the prior art 
contains all of the recitations in the claim. But a single prior-art 
reference need not contain exactly the claimed invention. Validity 
challenges often combine two or more prior-art references that together 
render the claimed invention obvious. It’s helpful for a challenger to 
collect a variety of prior art, because even though the individual 
pieces in isolation may be inadequate, the collection may establish 
invalidity.



-- 

http://www.gutenberg.net - Fine literature digitally re-published
http://www.plos.org - Public Library of Science
http://www.creativecommons.org - Flexible copyright for creative work


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