UNITED STATES PATENT AND TRADEMARK OFFICE  CERTIFICATE OF CORRECTION  Page 1 of 1  PATENT NO.  : 6,878,770 B2  DATED  : April 12, 2005  INVENTOR(S)  : Christian Herzig et al.  It is certified that error appears in the above-identified patent and that said Letters Patent is  hereby corrected as shown below:  Column 21,  Line 25, after "formula" insert  -NW-R $^{4}$-NW- I  I  Signed and Sealed this  Fourth Day of October, 2005  JONW.DUDAS  Director of the United States Patent and Trademark Office 