https://www.centerforfoodsafety.org/files/seed-giants_final_04424.pdf
In most cases the outcomes have been settlements, most farmers simple can't afford to sustain the fight. I think there have been some that made it through the court system and ended up working against the farmers.
I haven't read this whole report, but I read the relevant section starting on page 29. It was sourced from this Guardian article: https://www.theguardian.com/environment/2013/feb/12/monsanto-sues-farmers-seed-patents