How can I challenge a granted patent in Iran?

After a patent has been granted, interested parties may file a request for invalidation at any time with the Public Court of Tehran. Partial invalidation is possible. A request for invalidation may be filed in cases where (1) the invention is not new, (2) the patent has been obtained illegally, and (3) the invention is purely scientific and theoretical in nature and is of no practical use. The Public Court of Tehran has no branches in other cities or towns, so all cases should be referred to the court in Tehran.