I think that every does as Rambus went off a few years ago and patented every conceivable type of memory system.
To put it another way, Rambus has patents that are fundamental to the operation of high speed memory devices, memory controllers and interconnects.
The list includes well known types such as SDRAM, DDR1 and DDR2. Todays verdict just applies to SDRAM and DDR1 product made by Hynix.