Public written disclosure (publication) of how to make and how to use an invention before the filing date of a priority patent application precludes the subsequent filing of a PCT patent application that could issue as a national patent in countries other than the U.S. or the Philippines. Of course, the disclosure must have been complete enough to enable a person skilled in the art to practice the invention. If the invention does not enter the "prior art" prior to the filing date of a priority patent application, then a PCT patent application must be filed within the 1 year period (provided by the Paris Convention) following the filing date of the (earliest) priority patent application, otherwise, a PCT patent application may not be filed on the invention.
