seems the relevant patent is http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=H...
patented by this guy https://www.intellectualventures.com/buzz/insights/inventor-...
patented by this guy https://www.intellectualventures.com/buzz/insights/inventor-...
https://www.rpxcorp.com/wp-content/uploads/sites/2/2017/05/t...
As an outsider it looks to me that the US patent system is seriously limiting your innovation.
Reminds me of the patent / copyright troll from Silicon Valley. But worse, this guy "invents" things that already exist. I wish we could ban people (and their companies) from owning patents if they are found to be abusing the patenting system purely to not innovate but even worse they financially stall nonprofits who do innovate. Like seriously.