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Someone has found Shimano patents
Shimano (and SRAM) file a lot of patents, frequently of dubious merit, not with the intention of using the IP in their own products but to place road blocks in the way of competitors. It's entry level patent trolling. In some jurisdictions and some eras, you actually had to bring a product to market within typically three years in order to benefit from the ten to twenty year exclusivity protected by the patent office. Maybe we should bring that back.
gbj_tester
Someone has found Shimano patents for 13 speed fully wireless Di2
https://www.globalcyclingnetwork.com/tech/news/new-patent-suggests-shimano-is-designing-13-speed-fully-wireless-electronic-groupset