The receipt of the notice of oral hearing in the invalidation procedure or review procedure shall be signed or sealed by the parties concerned. If he expresses his intention to participate in the oral hearing, he shall state the names of the people who participated in the oral hearing. If it is necessary to designate a witness who has testified to testify in court, it shall be stated on the receipt of the notice of oral hearing, indicating the name of the witness, the work unit (or occupation) and the facts that need to be proved.
The number of participants in the oral hearing by each party and its agent shall not exceed four. If the number of participants in the oral hearing indicated on the receipt is less than four, other people may be appointed to participate in the oral hearing before the oral hearing begins. If more than one party participates in the oral hearing, it shall designate one of the parties as the first speaker to make the main speech.
If a party is unable to attend the oral hearing on the specified date, he may entrust his patent agent or other agent to appear in court.
Where a party entrusts a patent agency to act as an agent in accordance with Article 19 of the Patent Law, the agency shall entrust a patent agent to participate in the oral hearing.