At what point in a drug's lifecycle does the 20-years of patent protection begin?

At what point in a drug's lifecycle does the 20-years of patent protection begin?

• A. The date the company files the patent
• B. The date the drug is approved by the FDA
• C. The date of first sale in the US
• D. The date the drug enters market

Answer: (A)

Patents start counting from the moment the patent application is filed. The 20-year term runs from that filing date, not from FDA approval, the first sale, or when the product enters the market. This setup ensures a predictable period of protection even though development and regulatory review can take years. In practice, there can be adjustments or extensions to this term for regulatory delays, but the fundamental rule is 20 years from the filing date.

Patents start counting from the moment the patent application is filed. The 20-year term runs from that filing date, not from FDA approval, the first sale, or when the product enters the market. This setup ensures a predictable period of protection even though development and regulatory review can take years. In practice, there can be adjustments or extensions to this term for regulatory delays, but the fundamental rule is 20 years from the filing date.