To point out… Microsoft’s patent is hardly admissible. There were devices sold and released well before their patent date.
For example, the Mindstorm iBar was sold before 2006, here is an install in May 06!
Likewise, there are now a raft of companies selling multi-touch devices (iphone anyone). The thing with patents is that you can file anything, it depends on your patent search and what you find as to whether you would continue to apply for the patent. It also matters what other patents exist, what products were publically available etc… It’s not as cut and dry as “here is a patent, now all your stuff is in breach”.
If you patent something very specific which is a technical improvement, that is a lot more fixed in stone and more likely to hold up to scrutiny. Microsoft just tries to patent absolutely everything as a preventative measure against competitors doing exactly the same thing.
@Mo - Welcome to the market (potentially). Of course, you could become a Mindstorm reseller