Final answer:
Courts usually seat seven to nine jurors in most patent cases to ensure a unanimous verdict and minimize biases.
Step-by-step explanation:
The main reason why courts usually seat seven to nine jurors rather than six or twelve in most patent cases is to ensure a unanimous verdict. Having a larger jury panel allows for more diverse perspectives and can help minimize biases. Additionally, accommodating expert witnesses may also be a factor in determining the size of the jury.