We heard there is a patent on compression mount of Silhouette Minimal Art, i.e. the lens fixing system. We all know a lot of smaller manufacturers and traders have been selling copies for a long time. However, I don't understand why bigger brands like Zeiss, Nikon, Longines, Zyloware Invincilites, Mount Eyewear, Jonnathan Cate, etc.....are all using the same feature, without the fear of litigation. What's going on here? Has the patent already expired?
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