From the Sergent Engineering home page:
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Sergent Engineering experienced record profit in 2017, but what about the future? Sergent Engineering has been around for almost 20 years now and I am very proud of what has been accomplished. For 20 years, I have personally been making couplers. It's time to think about what comes next. I don't know when (so don't bother asking), but sometime this journey will end for me. I love my customers and refuse to leave them out in the cold. Consistent with that goal, I am placing all the coupler designs in the public domain now. If you are interested in having your own copy of these designs Click here.
Sergent Engineering has never been a typical business. No doubt, this news is further evidence of that fact. My hope is that other small (and large) manufacturers will follow suit and allow their designs to live on in perpetuity rather than allowing good products to die in a virtual intellectual property trash heap as a result of changing markets, business interest, and aging owners. We have done many things first. How's that for one more first from Sergent Engineering?
Fort Worth TX