Another example of prior art, while being "a little bit exotic," are software synthesizers, said De Koning. Software synthesizers use input from a keyboard, which can be compared to a multitouch device, he said. The synthesizer software is able to switch between a monotone and a polyphone input, and in the monotone mode the software ignores certain keystrokes, which is similar to Apple's technology, and therefore it is not inventive, said De Koning.

Kleemans called the synthesizer angle a "creative find" but emphasized that the technology doesn't even use a touchscreen. "Any relevance is hard to find," he said.

The case is the second time Apple has made a claim against Samsung in the Netherlands using the touch event model patent. Apple was denied an injunction on Samsung's products in preliminary proceedings regarding the patent at the Court of the Hague last year. Apple has also issued claims for the same patent in court cases in Germany against Samsung and Motorola Mobility, and in the U.K. against HTC.

The German court will rule on Apple's claims against Samsung and Motorola for the multitouch patent on Sept. 21. The U.K court ruled that Samsung does not infringe Apple's patent.

Judge Blok said he would closely read the German verdict to judge whether it is relevant to the Dutch case. The Hague court will deliver its judgment Oct. 24, Blok said.