This excerpt taken from the IMMU 10-K filed Aug 29, 2008.
Patents and Proprietary Rights
FACE="Times New Roman" SIZE="2">Our Patents
We have accumulated a sizeable portfolio of patents and patent applications in the course of our research, which we believe constitutes a very valuable business asset. Some of these patents relate to our diagnostic imaging products and product candidates, while others relate to our therapeutic product candidates. Still others relate to our technologies and other discoveries for which no product candidate has yet been identified. As of August 15, 2008, this portfolio included 119 issued U.S. patents. In addition, as of such date the portfolio included more than 295 issued foreign patents, with a number of U.S. and foreign patent applications pending.