If the citation classification numbers before and after a patent are different, it means that the classification of this patent involves at least two technical fields. In order to ensure that all technical fields addressed by the application are covered, the examiner uses multiple classification numbers. combined approach.
The classification number only classifies the technical solution in the patent document. This classification may be for a certain aspect of the technical solution. For example, solenoid valves, involving valves, will be classified into Part F, or Involving electromagnetism, it may be classified into Part H. Therefore, it is determined based on the technical solution (the content of the patent document) and has nothing to do with the classification number.
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