Go to USPTO Patent Full-Text and Image Database, page for advanced search:
http://patft.uspto.gov/netahtml/PTO/search-adv.htm
For example, if looking for patents issued between 1/1/2006 and 12/31/2009 (mm/dd/yyyy), type in the box:
isd/1/1/2006->12/31/2009
There are a list of field codes and an explanation of how to use each field code can be found by clicking the link under the Field Name. |