August 4, 2021
Introduction
Currently, under Vietnam’s Law on Intellectual Property of 2005, as amended in 2009 and 2019 (“IP Law”), secret prior art cannot be used in evaluating patent applications. However, an approach to evaluate secret prior art has been included, for the first time, in the draft amendment of the IP Law. Below is our discussion of this interesting topic.
Recognition in Other Jurisdictions
Secret prior art is the name given to prior art that, at the time of filing of a new patent application, was not discoverable by the new applicant or not publicly available. It exists as a filed but unpublished application, unavailable to the public until publication. Until that point, only the applicants and the patent examiners of the unpublished application know of its existence. Even though it is not discoverable or available to the public, secret prior art can still be used as a bar for novelty in many jurisdictions. Secret prior art is not limited to situations in which the first applicant and the new applicant are different people; secret prior art applies regardless. There is, however, a domestic limitation: Applications filed and not yet published in a foreign country are not considered to be secret prior art.
When the applicants are different people, the new applicant has no way of discovering the secret prior art that exists as a filed and unpublished application of the first applicant. Regardless of the completeness of the patent search, the previously filed and unpublished application cannot be discovered. At the time of filing, the new applicant’s invention would seem novel. Later, it would be discovered that the application was actually filed after another application for the same invention, barring patentability. This creates confusion and unfairness among multiple applicants.
One applicant can also file two separate applications at different times, in which the later