Rambus is the company best known for suing dozens of companies over memory patents that it holds and is suing so prolifically, that many just see this company as a patent troll. It has been accused many times of obtaining submarine patents while a member of the JEDEC group until a decade ago, which it is now fraudulently using to try and extort royalties from every other company using DDR memory and its derivatives. Unfortunately, those lawsuits didn't stick, encouraging Rambus to carry on enthusiastically. Rambus won patent fights against NVIDIA and Samsung for example, who now have to pay them ongoing royalties. However, it looks like Rambus may have bitten off more than it could chew, because it has just lost a $4 billion antitrust lawsuit against Micron Technology Inc and Hynix Semiconductor Inc, erasing more than half of the chipmaker's value as investors abandoned its stock in droves. Rambus stock immediately plunged more than 60% on this good news.