By Diane Bartz WASHINGTON (Reuters) – The U.S. Supreme Court said on Monday it would not take on an Internet technology patent case that pitted a company accused of aggressively enforcing weak patents against another with an equally tough reputation for fighting patent infringement claims. The closely watched case involved the online shopping site Newegg Inc, which specializes in computer products, and software company Soverain Software LLC, which had accused Newegg of infringing three patents known as the shopping cart patents, which describe a way to buy products online and pay for them. Against Newegg, Soverain won in the U.S. District Court for the Eastern District of Texas but lost at the U.S. Court of Appeals for the Federal Circuit, which ruled that the three online shopping patents were invalid because they were obvious.