Enforcement Rules of the Patent Act Article 5

Where a person files a patent application or taking other proceedings in connection with patent matters in written form, the date of application and other proceedings shall be the date on which the Specific Patent Agency receives the written document; however, where the delivery thereof is made via post, the date of application and other proceedings shall be the postmark date.The date of application and other proceedings whose postmark date appears to be ambiguous shall be the date of receipt by the Specific Patent Agency, unless otherwise proved by the parties involved.