A major company of resource recycling announced that they had been granted a patent (Japanese Patent No. 6465825) on a method of recovering precious metals from incineration ash with high quality.
As a result, the stock price of the company became stop high.

Since the patent application documents have been published before patent granted, if you are familiar with the technology, you can read it and buy its stocks in advance.

Do you know the name of this method for checking the patent application documents and judge if you buy stocks or not?