Thats the way I understand it as well. They are trying to patent a jig They are also trying to patent the curve in the blade but not the blade itself. The letter states that if you have any questions to email them and they will be glad to help. I have emailed them 4 times asking what exactly I am doing to infringe upon their rights and I will change it. The first email went out months ago, I am still waiting for a response... Some help.