Des Moines Register: Kinze Manufacturing is accusing Deere & Co. of operating an “unlawful monopoly” as the two agricultural equipment makers tangle over a patent dispute. Responding to a lawsuit from Deere that could block it from selling a new planter add-on, Kinze filed an antitrust counterclaim last week. Kinze’s attorneys accused Deere, a Fortune 500 company, of using its market power to pressure dealerships not to sell Kinze products. The Williamsburg-based farm implement manufacturer also accused Deere — headquartered in Moline on the Illinois side of the Quad Cities — of using “invalid patents” to file “baseless, sham” lawsuits to overwhelm competitors with legal bills.