To apply for a PCB patent, you usually need to meet the following requirements:
1. Novelty: PCB design must be new, and it has not been made public or used by others before the application date.
2. Creativity: The design of PCB must have non-obvious creativity, that is, it is different from the known technology or has important technological progress.
3. Industrial Applicability: PCB design must be designed for practical industrial applications, not just theoretical concepts.