You can conduct an online search for patents that are already registered at the Patents Registry, Intellectual Property Department, the Government of the Hong Kong SAR (https://esearch.ipd.gov.hk).

Searches for patents that are registered outside the Hong Kong SAR can also be undertaken at the websites of various jurisdictions, for examples:

• China National Intellectual Property Administration
• European Patent Office
• Intellectual Property Office (United Kingdom)
• United States Patent and Trademark Office
• World Intellectual Property Organization
• Google patent search