Originally Posted by cgutjahr
The USPTO has a nice searchable patent database
(use "quick search" then search for "Assignee name" = Commodore). The list of results is sorted chronologically. start at the bottom and then go up the list.
For somewhat complicated reasons
, the patents in question expire either 17 years after the issue date or 20 years after the filing date - whatever is the longer term. I count 6 patents which are still active, all of which will expire in the next year.
But the copyrights last nearly forever: http://www.copyright.gov/help/faq/faq-duration.html