Wyoming
How Festo Corp. v. Shoketsu Kinzoku Kogyo Kabushiki Co. applies in Wyoming: state-specific rules, key cases, and bar exam notes for Patent Law.
Wyoming follows the doctrine of equivalents as established in federal law, particularly the Festo principles, which emphasize that amendments during patent prosecution may limit a patentee’s ability to assert their patent under the doctrine of equivalents. The state courts tend to uphold these principles but have minimal case law specifically addressing Festo.
In Wyoming, the same Festo principles apply, whereby prosecution history estoppel can prevent a patentee from claiming equivalence if they make a narrowing amendment during prosecution.
The court held that a narrowing amendment during patent prosecution created prosecution history estoppel, preventing the patent holder from asserting the doctrine of equivalents.
The court ruled that the patentee could not claim that a product infringed beyond the literal claims due to previous amendments.
Wyoming's approach closely mirrors the federal standard established by Festo, adhering to prosecution history estoppel principles. However, Wyoming courts have been less active in patent litigation, leading to fewer interpretations at the state level.
Understanding Festo's implications on prosecution history estoppel is crucial for the Wyoming bar exam, particularly in patent law questions.