Technology is progressing so fast today that anything that is revolutionary would be copied and cloned extremely quickly. In order to protect one's innovation, one has to quickly apply for patents and copyrights so that the profits that can be earned are not stolen by other companies that might copy your products. However, sometimes it is hard to know if what you created might be totally original, like what the two companies in this article are facing. That leaves to their lawyer to fight out in court.
Simon - http://www.starrausten.com
The digital power management is an attractive market with the growth of mobiles, tablets, smart TV's, etc. I am not surprised to see companies fight tooth and nail on claims in their PWM controller patents.