Is granular building block a patent of Lego?

This is a Lego patent. According to the inquiry of Lego official website, granular building blocks are the patent of Lego. However, due to the expiration of patents, many domestic manufacturers focus on small particles of building blocks and do a very good job. Not only small, but also can be matched with other brands of Lego bricks, because everyone is made according to a standard.