A company is claiming damages in excess of $20 million from Apple, stating that the computer company’s use of tabs in Mac OS X 10.4 ‘Tiger’ infringes on patents it took out in 1987.

Illinois-based IP Innovation says that Apple has engaged in "willful and deliberate" infringement of a computer control patent by selling its current Tiger operating system, according to a report by Apple Insider.

The company is seeking an injunction against Apple, prohibiting it from selling Mac OS X.

The central claim of IP Innovation seems to apply to Apple’s approach to navigating in the Finder and Spotlight. Category dividers triggered by Spotlight searches, as well as page tabs in the Safari web browser, bear the closest similarity to the now 20-year-old description, explains Apple Insider.