FTR If an “individual” wants to build my patented Coanda Channel technology for “personal use,” more power to him/her. But for profit (commercial production), I would have a problem with that.
I patented my channel technology to keep surfboard/kneeboard/bodyboard companies from using my ideas for their profit. I designed the channel with the principles of the Coanda Effect — observed and documented by Henri Coanda (1910 and 1934-1936). The curve equations I generated were based on fluid mechanics designs.
It is not unreasonable to want protection from people who seek to “profit” from my ideas (intellectual property).