Amazon patent applications published on 16 June 2016

4 US patent applications published on 16 June 2016 and assigned to Amazon

1 20160173406 SYSTEM AND METHOD FOR CONTROLLING ACCESS TO WEB SERVICES RESOURCES
2 20160171064 EFFICIENT QUERY PROCESSING USING HISTOGRAMS IN A COLUMNAR DATABASE
3 20160170908 STORAGE DEVICE AUTHENTICATION
4 20160170885 CACHED VOLUMES AT STORAGE GATEWAYS