The IP Code of the Philippines does not expressly state that patented products must bear patent markings which serve to notify the public and competitors that products are patented. However, Section 80 of the IP Code provides that "damages cannot be recovered for acts of infringement committed before the infringer knew, or had reasonable grounds to know of the patent. It is presumed that the infringer knew of the patent if on the patented product, or on the container or package in which the article is supplied to the public, or on the advertising material relating to the patented product or process, are placed the words Philippine Patent with the number of the patent." This simply means that notice of infringement may be served either actually, or constructively by said patent marking.