I got curious and went to consult Amazon's patents. Among several others, in the same line, I found this one in particular: WO2020264431A1 2020-06-26 Connection pooling for scalable network services. I visited the patent page: https://patents.google.com/patent/WO2020264431A1/en And essentially it's the (detailed) description of how a connection pool works. "Ipsis litteris" !!! Is it just me who thinks this kind of patent is simply nonsense? IMHO, the only purpose of this type of patent is to intimidate or trolling other companies with less money to spend on giant legal departments and non-sense patent disputes.