Patent Number
Patent Assignee
Legal Status	Any Change in Legal Status Adverse Decision Certificate of Correction Disclaimer/Dedication Expired (non-payment of fees) Reassigned Reinstated Extended Reexamination Requested Reexamination Certificate Issued Reissue Requested
Patent Year	1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 To 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013
	Note: There is a charge for titles from certain sources; see price list.
	E-Mail help desk

Search Tips
Choose Your Options
Use only the search options that you need--leave the others blank.
Patent Number
Enter the two-letter country code followed by a space and the number just as it appears in the patent or citation, with all punctuation. For example, patent number US 5,251,236.
Patent Assignee
Enter the name of the assigned owner. For example, SILICON GRAPHICS. Do NOT include words like Corp., Inc., etc.
Legal Status
You can search for changes in the legal status such as expiration, reinstatement, reexamination, etc.
Patent Year
Leave this blank unless you need to focus the search by year. For fastest processing, use the smallest year range you need.

Sources
CLAIMS®/Current Patents Legal Status from IFI CLAIMS Patent Services. Information on the current status of U.S. patents, including legal status and reassignment data provided by the U.S. Patent & Trademark Office. Reassigned patents from 1980; reexamined patents from 1981; expired patents from September 1985; extended patents from April 1986; reinstated patents from October 1986.