The Elephant
Given how little new physics and genuine innovation (I can count less than 20 in electronics in last 20 years), most of these are bogus patents. Either not really innovative, obvious to anyone expert in the art, already done etc.
Also how many are not "inventive" but what in UK would be simply registered designs?
How many are existing technology dressed up in a new description?
It's an intellectual war legal battle, not innovation. The USPTO idea is that companies and individuals test validity in court. This unfairly penalises everyone except International Behemothic Moneyed, companies and similar.
I can't believe that ALL tech people together in the world can come up with 1500 real patents for Electronics (any software, GUI etc should be invalid, only novel UI devices should be possible for GUI, and in reality there have been none of them since mouse & touch screens, or pens that don't use screen image optically, the Wacom type pen is pretty old, digitisers with a puck older. Light pens, touch screen and tracker ball predate mice).