Case maker M-Edge filed suit with a Maryland court last week accusing Amazon of "unlawful corporate bullying" and patent infringement relating to the company's line of Kindle cases. According to M-Edge, the company signed a three-year agreement with Amazon in November 2009 for a 15-percent sales commission, only to have the retail giant demand a new contract with a 32-percent cut a mere two month later. A lawyer for M-Edge told The Wall Street Journal that Amazon punished the case maker over its refusal to play ball, after threats of burying the company's products on its site. According to the filing, M-Edge finally caved and signed a new contract in July of last year, given the fact that Amazon apparently drives nearly 90-percent of the small company's revenue. The suit also accuses Amazon of "knocking off" its reading light-packing covers with lighted jacket designs for the Kindle 3. Amazon, for its part, has refused to comment on the matter.