List of email filtering patents

Patent 7353204 was granted and assigned to Zix Corporation on April, 2008 by the United States Patent and Trademark Office.

Patent 7475256 was granted and assigned to Zix Corporation on January, 2009 by the United States Patent and Trademark Office.

Patent 7574607 was granted and assigned to Zix Corporation on August, 2009 by the United States Patent and Trademark Office.

Patent 8166118 was granted and assigned to Sendside Networks on April, 2012 by the United States Patent and Trademark Office.

Patent 7539725 was granted and assigned to Zix Corporation on May, 2009 by the United States Patent and Trademark Office.

Patent 7849213 was granted and assigned to Sendside Networks on December, 2010 by the United States Patent and Trademark Office.

Patent 7493661 was granted and assigned to Zix Corporation on February, 2009 by the United States Patent and Trademark Office.

Patent 7136841 was granted and assigned to Zix Corporation on November, 2006 by the United States Patent and Trademark Office.

Patent 8027923 was granted and assigned to Zix Corporation on September, 2011 by the United States Patent and Trademark Office.