Intellectual Property Code
Section 97. Compulsory License Based on Interdependence of Patents. - If the invention protected by a patent, hereafter referred to as the "second patent," within the country cannot be worked without infringing another patent, hereafter referred to as the "first patent," granted on a prior application or benefiting from an earlier priority, a compulsory license may be granted to the owner of the second patent to the extent necessary for the working of his invention, subject to the following conditions:
97.1. The invention claimed in the second patent involves an important technical advance of considerable economic significance in relation to the first patent;
97.2. The owner of the first patent shall be entitled to a cross-license on reasonable terms to use the invention claimed in the second patent;
97.3. The use authorized in respect of the first patent shall be non-assignable except with the assignment of the second patent; and
97.4. The terms and conditions of Sections 95, 96 and 98 to 100 of this Act. (Sec. 34-C, R.A. No. 165a)