As far as patents go, I have something that I have been curious about. I have ariser made by Jim Brackenbury. It uses the Bear clamps to accept the Bear limbs. Jim only made two, and the other one is in a private collection in Montana or Idaho.
With this riser I use a pair of Shaffer limbs that were made to be used with the Bear risers. I purchased the limbs separately. They make a beautiful combination, and a great shooting bow.
bkupris
I have two Gainseville risers, one original '70 Greyling riser, and then the Brackenbury Riser. I can mix and match these with several sets of limbs I have from Greyling, Gainseville, and the Shaffer limbs ranging in weights from 43# to 70#, all Number two limbs making a 60" bow. I have never heard any groaning, creaking, or other noises when drawing the bow. the latch system is quite solid and quiet. I can't speak for others that may have experience noises, but I have not.
My curiosity is, how could Shaffer and Brackenbury produce these items without violating the Bear patents. Unless of course they paid a royalty for the right to make them. I understand thatShaffer made many sets of limbs like this, but Brackenbury only made two risers.
Anyone got any ideas.