In practice, many individuals, startups, and companies often:Introduce new products to the market;Publish promotional videos;Participate in exhibitions;Post information on websites or social media;Send samples to partners;Seek investment funding;Before filing a patent application.However, this is one of the most common reasons why many patent applications are rejected in Vietnam and internationally. Under Vietnamese intellectual property law, one of the essential requirements for patent protection is novelty. If an invention has been publicly disclosed before the filing date, the risk of losing novelty is extremely high.Understanding the proper timing of disclosure helps:Protect intellectual property rights;Avoid losing patentability;Optimize technology commercialization strategies;Minimize legal risks during product exploitation.