Methods for patent summarization are disclosed. A digital file comprising an issued patent document or a published application is acquired. At least one claim string is acquired from the digital file. Multiple elements are acquired from the claim string. A part-of relationship architecture among a portion of the elements is generated according to the claim string. At least one is-a relationship for at least one of the elements is generated according to the claim string. At least one association relationship for at least one of the elements is generated according to the claim string. The part-of relationship architecture, as-is relationship and association relationship are displayed.