Section 4
SEC. 4. In order to justify recovery for violation of trade-mark rights in the preceding sections defined, it shall not be necessary to show that the trade-marks have been registered under the royal decree of eighteen hundred and eighty-eight, providing for registration of trade-marks in the Philippine Islands, in force during the Spanish sovereignty in these Islands, nor shall it be necessary to show that the trade-mark has been registered under this Act. It shall be sufficient to invoke protection of his property in a trademark if the party complaining shall prove that he has used the trade-mark claimed by him upon his goods a sufficient length of time so that the use of the trade-mark by another would be an injury to him and calculated to deceive the public into the belief that the goods of that other were the goods manufactured or dealt in by the complaining party.