Patent Calendar  
The Uruguay Round of GATT changed the expiration date of many U.S. utility patents. If you are uncertain of the expiration date of your patent we can calculate that date for you. To view a customized U.S. utility patent expiration date and maintenance fee calendar, fill in the information below:

Earliest Effective Filing Date:   (MM/DD/YYYY)
Application Filing Date:  *   (MM/DD/YYYY)
Issue Date:  *   (MM/DD/YYYY)
Term Adjustment [?]:   (In days, or blank if none.)