April 26th is World Intellectual Property Day, a time to celebrate innovation and the laws that protect inventors. But sometimes, the biggest threats to patents don’t come from competitors or courtrooms. They come from translation errors.
Here are three real cases where patent translation mistakes led to massive financial losses.
Ecuador Lost $1.1 Billion Over Bad Translations
When Occidental Petroleum sued Ecuador, the case depended on understanding Ecuadorian contract law. But there was a problem: the English translations of Ecuador’s legal documents were wrong.
Professor Brigitte Stern, who reviewed the case, found that translators had changed important legal terms. In Spanish, Ecuador’s law required a specific type of document called a “public deed.” But the English translation said it only needed “essential elements,” which is much broader and less specific.
This translation error changed how the judges understood Ecuador’s laws. Professor Stern wrote that if the translations had been correct, “the conclusions arrived at by the majority would have been impossible to sustain.”
The tribunal originally ordered Ecuador to pay $1.7 billion. After finding the translation errors, they reduced it to $1.1 billion. That’s still the largest amount ever reduced in this type of international case. Ecuador paid hundreds of millions of dollars because translators got the words wrong.
One Word Nearly Destroyed a European Patent
In 2021, an Italian court heard a case about Schluter’s patent for a special panel. The English version said the invention needed a foam core that was “moisture-resistant and moisture-proof.” Both properties were required.
But the Italian translation changed “and” to “or.” Now it read “moisture-resistant or moisture-proof.” This meant only one property was needed, not both. That single word made the patent much broader than intended.
The company TEMA argued this translation error made Schluter’s patent invalid. Schluter caught the mistake just in time and filed a corrected translation. The court allowed the correction because TEMA hadn’t started making products yet based on the wrong translation.
If Schluter had caught the error even a few months later, they could have lost their patent protection in Italy completely.
A Drug Company Lost Its Patent Because of “Half-Liquid”
IBSA Institut Biochimique owned a U.S. patent for thyroid hormone medications, including their product Tirosint. The patent originally came from an Italian application that used the word “semiliquido,” which means “semi-liquid” in English.
But when IBSA filed in the United States, the translator used “half-liquid” instead of “semi-liquid.” This created a big problem. The court found that “half-liquid is not a well-known term in the art” and that experts couldn’t figure out what it meant.
When Teva Pharmaceuticals wanted to make a generic version of the drug, they challenged the patent. The Federal Circuit court invalidated IBSA’s patent because the term “half-liquid” was too unclear. The court said patents must be “precise enough to afford clear notice of what is claimed.”
IBSA could have avoided this problem completely. U.S. law allows companies to file patent applications in their original language and provide an English translation later. If IBSA had done this, they could have easily fixed any translation mistakes.
Why Professional Translation Still Matters in 2026
These cases show why patent translation needs experts, not just people who speak two languages. Patent translators need to understand the technology, the law in both countries, and how small word changes affect legal meaning.
This World Intellectual Property Day, remember that protecting your inventions globally means getting the translation right. Your innovation deserves accurate translation that protects your rights in every language and every country.
Need expert translation for your patents? Contact us today to protect your intellectual property with accurate, professional translation services.
Written by Valentina Rodriguez