Why did dihydroquercetin apply for a patent in the United States?

The United States first began to study. Dihydroquercetin, also known as yew leaf element, whose molecular formula is C 15H 12O7, is the raw material of high-grade food. Since 1960s, American scientists began to study the medicinal value of dihydroquercetin. The American CA database shows that 56 international authoritative organizations are doing scientific research. Dihydroquercetin applied for a patent in the United States, because the United States first started research. The United States, Japan, South Korea, Russian and other countries have successively developed oral products such as medicines and foods with dihydroquercetin as raw materials, making dihydroquercetin serve human health.