About: http://webisa.webdatacommons.org/326655871

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	The invention is especially applicable to types of materials such as polytetrafluoroethylene where it is impractical to make seals by molding a resilient thermosetting elastomeric material into a complex shape.
http://www.w3.org/ns/prov#wasQuotedFrom	patents.com