The Neomax (Sumitomo) and Magnequench (GM) patents do require licences for Neo magnets that contain cobalt and have tetragonal structures. I am curious if all high energy (>30MOe) and high temperature (>110C) magnets use this type of technology.
There are lots of patents on Neo magnets and they are difficult to sort out. Some of the patents restrict the use of the magnets that contain cobalt and/or have a tetragonal crystalline structure.
Does someone know:
What types of magnets contain cobalt?
What types of magnets have a...