About: http://webisa.webdatacommons.org/269421440

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	by flowing a hot gas, preferably inert, such as nitrogen, carbon dioxide, flue gas, methane, and the like, through the clay bed.
http://www.w3.org/ns/prov#wasQuotedFrom	patents.com