Section 4
SEC. 4. Patents for inventions or discoveries made or manufactured in the Philippine Islands shall not pay any tax. The patentee in such cases shall pay only the sum of twenty pesos upon receiving the patent, in addition to the fees established in section thirty-three for the registration and the expenses of publishing the application. Patents for inventions or discoveries manufactured or made entirely or largely in foreign countries shall pay a tax of twenty pesos per annum during the life of the patent and on the date of their issue. The provisions of this section shall not be applicable to public officers and employees desiring to register a patent for an invention for the use of the Government, in which case the inventor shall state in his application that the Government of the Philippine Islands or any of its officers or employees may use said patent in the execution of work of the Government without any payment to the inventor, which condition shall be set forth on the letters patent.