The PatCheck Extension is a free add-on for the Chrome browser that significantly enhances the functionality of the EPO Espacenet patent search. It provides users with the ability to view the current protection status of patents, indicating whether they are applied for, protected, or have no protection. This feature is essential for researchers and businesses seeking to navigate complex patent landscapes.

In addition to its display capabilities, the extension offers monitoring services for the protection status of patents across all countries within a patent family. Users can receive email notifications regarding any changes, ensuring they stay informed about relevant patents. Furthermore, the extension allows for CSV export of the current protection status, facilitating easy data management and analysis.