So, this proves that the patent office are a bunch of idiots.
And that amazonium are just out to legally corner the market.
So, you have this battery pack (and a box) being held up by some arms and whirling propellers. And then, jettisoning the propellers will make the impact less on a person? The propellers, even non functioning, would slow down the decent rate of the battery pack.
And, why are we even talking about flying drones delivering things? We are complaining about our energy usage. So, why should we spend 10x as much energy (rotating blades is very inefficient) to deliver a package?