2. Necessary technical features: The necessary features in the technical scheme to solve the technical problems of invention-creation are called necessary technical features. Without any necessary technical features, technical problems cannot be solved.
3. Non-essential technical features: The features that are dispensable in the technical scheme to solve the technical problems of invention-creation are called essential technical features. Technical problems can be solved without any unnecessary technical features.
4. Differentiate technical features: Differentiate the technical features of comparison documents.
5. Specific technical features: refers to the technical features of each invention or utility model that contribute to the existing technology as a whole. Generally refers to the characteristic part in the weight 1.
Two: How to write technical features
1. First, list all the necessary technical features of your invention.
2. Then, from all the listed necessary technical features, two types of necessary technical features are screened out: A, which is different from the existing technology, and B, which is different from the existing technology.
3. Writing independent requirements = subject name+class A necessary technical features+features: (features:)+class B necessary technical features.
I hope my answer can help you.