1 If priority was not claimed when the utility model patent application was filed on December 20, 2001, the application date for Zhang’s “Forest Remaining Waste Burning Equipment” patent would be December 20, 2001 .
2 If the technical features are exactly the same, then the furniture factory used them first. Zhang’s utility model patent filed on December 20, 2001 has no novelty, and a furniture factory has not infringed Zhang’s patent. right, and he can file a claim that Zhang’s utility model patent right is invalid.