I saw this subject over on the bowsite and found it interesting. I have copied a couple of posts below.

TR states: WOW, After having read and reviewed the text and Drawings in United States Patent Office patent numbers RE37,544 , 6,082,347, & 5,934,265 I'm left scratching my head. My guess is that Hoyt must be paying a royalty on CAM & ½ to Darton.

my thoughts: I printed out and read through the patents belonging to Darton. (it took a special program to view the diagrams). In my humble opinion, the cam+1/2 would certainly appear to be covered by Dartons patents.

As long as Hoyt is paying a royalty to Darton, this would be no different than other bow companies paying a royalty to Mathews for using their cam designs.

Who would have guessed that the little guys like Darton would be out doing the big guys like Hoyt in the R & D department?