Not sure why a dish like curry from India, qualifies as Yoshoku, while ramen from China, does not. Perhaps the British or Dutch introduced it into Japan, so that association has stuck. Nevertheless, about 20 years ago, I remember House Foods inflamed Japan-India relations by applying for a patent on curry that the Indian government protested, and I believe House Foods eventually dropped it. However, I do think Japanese companies might have better luck taking out a patent on Spaghetti Napolitan since it uses unique ingredients (i.e., ketchup) not found in the Italian version that may provide the patent with sufficient novelty to win approval. That said, I doubt that the royalty income would be very high.
https://www.iol.co.za/news/eish/japa...-flavour-20994