Not knowing about the patent (only the info from the Forbes article), the device producing the sound from Tom Scott's video would have been around when that pat

Not knowing about the patent (only the info from the Forbes article), the device producing the sound from Tom Scott's video would have been around when that patent was still active. Therefore, either 1) it was from the company issuing the patent and they weren't able to bring it to the US market; or 2) it was from a different company. Given that the comments in the video mention that the US still has the beep-beep sound, I wonder if that was preventing the UK company selling the system to the US. In that case, why didn't the creator of the patent bring it to market in the US while it was still valid?