Cygnus Systems has sued tech heavyweights Microsoft, Apple, and Google, claiming that it holds the patent on a common file preview feature used by browsers and operating systems to show users small snapshots of the files before they are opened — saying that they infringed on its patent with products such as Windows Vista, Internet Explorer 8 and Google Chrome, which allow users to view preview images of documents on the computer. Mac OS X, the iPhone and Safari also infringe, the company said in court filings. Apple uses this technology in its Finder and Cover Flow Mac OS X features, the filings state.

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