An Australian Patent Opposition Round-Up from the Patent Office Journal dated 26 April 2012.
The following patent applications have been opposed as at 26 April 2012.
| Patent Application No. | Applicant(s) | Opponent |
| 2005238278 | Vector Corrosion Technologies Ltd | Concrete Preservation Technologies Ltd |
| 2007233252 | Merial Limited | Intervacc AB |
| 2009295253 | Inertial Orthopaedic Navigation Solutions Pty Ltd | KCAT Investments Pty Limited |
No additional opposition proceedings have been withdrawn as at 26 April 2012.
No applications for an Extension of Patent Term have been made or accepted as at 26 April 2012.