I'd guess those patents would have expired by now. They only last 20 years, and you must file them within 12 months of a product coming to market including that

I'd guess those patents would have expired by now. They only last 20 years, and you must file them within 12 months of a product coming to market including that invention or you forfeit the right to patent it. So any patents related to the 7000 line or earlier would have expired, and I don't see anything about this keyboard that is similar to later BB keyboards.