In Kimble v. Marvel, what did the court hold regarding royalties after patent expiration?

In Kimble v. Marvel, what did the court hold regarding royalties after patent expiration?

• A. Royalties may continue after expiration.
• B. Royalties cannot be collected for uses after expiration.
• C. Royalties must be renegotiated at expiration.
• D. Royalties are unaffected by expiration if the license is perpetual.

Answer: (D)

The main idea is that what happens to royalties after a patent ends hinges on the license’s duration. A patent lasts for a set term, but if the license itself is perpetual, the rights granted continue indefinitely. In that situation, the royalty obligations tied to those ongoing rights stay in force even after the patent expires, because the contract governs the use of the invention, not the patent term. So, royalties remain unaffected by expiration when the license is perpetual. In contrast, with ordinary licenses that aren’t perpetual, royalties typically end when the patent term ends unless the contract expressly provides otherwise, and renegotiation at expiration isn’t automatically required.

The main idea is that what happens to royalties after a patent ends hinges on the license’s duration. A patent lasts for a set term, but if the license itself is perpetual, the rights granted continue indefinitely. In that situation, the royalty obligations tied to those ongoing rights stay in force even after the patent expires, because the contract governs the use of the invention, not the patent term. So, royalties remain unaffected by expiration when the license is perpetual. In contrast, with ordinary licenses that aren’t perpetual, royalties typically end when the patent term ends unless the contract expressly provides otherwise, and renegotiation at expiration isn’t automatically required.