I once did a quick survey of how long it would take me to get completely caught up reading patent applications in just one area of ed tech. It would be, I discovered, several lifetimes. Calling it a 'patent thicket' is an understatement, by far. But this article is a fun read, picking up nine or so influential patents over the years, from the Skinner apparatus for teaching spelling (1866) to Blackboard's Internet-based education support system and methods (1999).
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