Patent Risk Advisory Firm RPX Files For An IPO

<img src="http://tctechcrunch.files.wordpress.com/2011/01/screen-shot-2011-01-24-at-2-15-06-pm1.png" />"Defensive patent aggregator"<a href="http://rpx.com">RPX</a> (Rational Patent) filed an <a href=

Patent Defense Play RPX Closes Series B From Index, Kleiner, And Charles River

<img src="https://beta.techcrunch.com/wp-content/uploads/2009/07/rpx-logo-1.png" width="211" height="74" /> <a href="http://www.rpxcorp.com/">Defense Play RPX,</a> a defensive patent aggregator, has

Is RPX's "Defensive Patent Aggregation" Simply Patent Extortion By Another Name?

<img src="https://beta.techcrunch.com/wp-content/uploads/2008/11/rpx-logo.png" /> Patent litigation is getting so bad that a new startup, <a href="http://www.rpxcorp.com/index.html">RPX Corp.</a> (ak