How to distinguish which industry an engineering patent belongs to?

According to the content defined in the claims, especially those specific functions and uses clearly pointed out, and the corresponding specific embodiments.

The technical field has no specific format, but is determined according to the scheme and manual written by the user.

Technical field The technical field of the invention or utility model should be the specific technical field to which the technical scheme of the invention or utility model belongs or is directly applicable, not its superior or adjacent technical field, nor the invention or utility model itself. This specific technical field usually involves the lowest position that an invention or utility model can be designated in the international patent classification.