A new analysis from IPWatchdog highlights a persistent tension in intellectual property law: design patents expire, but trade dress rights can last indefinitely. Both protect non-functional ornamental features, and the question is whether a patent owner can use the exclusivity period to build consumer association—and then keep competitors out through trade dress even after the patent ends.
The piece points to longstanding Supreme Court doctrine that the public must be free to practice an invention after a patent expires. That principle was applied to a product's form in the famous Kellogg shredded wheat case. Yet many later cases have allowed design patent owners to also obtain trade dress protection for the same design, effectively extending the patent's practical life. The article argues these decisions lack rigor.
The author suggests both trademark and patent law would benefit from courts clarifying how design patents and trade dress interact when they cover the same feature. Without clearer rules, the analysis concludes, the promise that patent protection is limited in time can be quietly undermined.