The Korean electronics giant Samsung on Monday told a trade judge that Apple did not pay for Samsung Electronics Co. (005930) technology which Apple used in its iPhone introduced in 2007, according to Bloomberg.

“Apple, in 2007, when they decided to enter an industry they’d never been in before, didn’t even inquire of there was a license they needed to take”, it said.

Samsung said that Apple devices, including the iPhone, iPad tablet computer and iPod touch media player have infringed as many as four patents. All came from two decades of work Suwon, South Korea based Samsung spent improving mobile phones, the attorney for the company said, the report said.

Samsung said that all of these things that it built up, Apple was using when it entered the market,” Samsung lawyer Charles Verhoeven of Quinn Emanuel said as a trial began today at the U.S. International Trade Commission in Washington.

The case before ITC Judge James Gildea, and another patent case by Apple against Samsung that’s in the midst of trial before a different trade judge, are part of a global battle between the two companies for increased share of a market that Bloomberg Industries said was $312 billion last year.

Apple denies infringing the Samsung patents and is challenging their validity, just as Samsung is doing in regard to Apple’s allegations.