Amazon and Jeff Bezos already face a patent dispute involving Kindle Fire

That didn’t take long. Two weeks after launching its Kindle Fire, the Amazon.com Inc. tablet has become the target of a patent-infringement lawsuit.

Smartphone Technologies LLC claims Kindle Fire infringes on four of its patents, according to PaidContent.

Smartphone Technologies is owned by Acacia Research Corp., which has been called a patent troll by its detractors. Acacia also has filed patent-infringement suits against Apple Inc. and BlackBerry maker Research in Motion Ltd.

In the suit against Kindle Fire, PaidContent says, Acacia seems to be focusing on commonplace features found in smartphones and tablets, including tapping an icon to make the device perform a function.

PaidContent says that Apple and other defendants in the Acacia patent suits are so far refusing to settle, possibly setting up drawn-out legal battles.

Kindle Fire runs on the Android OS, leaving it vulnerable to Microsoft’s claims that the OS infringes on its patents.

Here is more about the patent suit: It was filed in federal court in the Texas Eastern District. It names Amazon.com and Amazon Digital Services as defendants. The suit names four patents that Smartphone Technologies says the Kindle Fire violates. One is U.S. Patent No. 6,956,562, a patent that covers technology supporting touch screens.