You can select specific documents in the following fields:
Note: These searching options are only available in the Boolean and Advanced Search.
You can decide to search strictly through patents where the owner voluntarily indicated that he or she is willing to sell or license the rights to the patent.
The PCT field indicates that the application was filed through the Patent Cooperation Treaty (PCT). You can search through PCT or Non PCT documents by default; the search is conducted through All patent documents.
You can select the language of filing. The default option, "In both languages", allows patent document searches in the whole database. The two other options allow patent document searches within only laid-open applications and patents granted on or after August 15, 1978.