“On November 10, 2010, Graphics Properties Holdings, Inc, formerly known as Silicon Graphics, Inc, sued Apple for allegedly infringing on their patent regarding floating point rasterization,” Jack Purcher reports for Patently Apple.

“Well, it appears that Apple has decided to counter sue and is now preparing for a showdown,” Purcher reports. “The California courts revealed late last week that Apple had filed two patent infringement cases against Graphics Properties Holdings – though the courts have yet to open the electronic versions of the complaints. While it may be due in-part to the Thanksgiving Holiday schedule, the fact remains that we’re still in the dark as to the details of these filings.”

Purcher reports, “In other IP News today, Apple has won another round of iPhone 4 Design Patents in China.”

Much more in the full article, including Apple’s patent application illustrations, here.