content_image/922013.jpg
PATENT NO. : 7,371,273 B2 

APPLICATION NO. : 10/741536 

DATED : May 13, 2008 

INVENTOR(S) : Kent D. Vincent et al. 

## UNITED STATES PATENT AND TRADEMARK OFFICE 

## CERTIFICATE OF CORRECTION 

Page 1 of 1 

It is certified that error appears in the above-identified patent and that said Letters Patent is hereby corrected as shown below: 

On the title page, item (57), under "Abstract", in column 2, line 1, after "present" insert -- invention --. 

In column 18, line 57, in Claim 8, delete "pka" and insert -- pKa --, therefor. 

Signed and Sealed this 

Fifth Day of May, 2009 

<img src='content_image/922013.jpg'>

