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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?



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It doesn't take much of a change to the product for any company to legally produce something very similar.
To remove all speculation , my suggestion would be to contact Hoyt and ask them if their paying royalties to Darton.

Martin Archery patented Vibration Escape Modules in 1995(I believe) and Mathews came out with their Harmonic Dampeners in 2000 and I dont believe they paid any royalties to Martin.