By Julia Karow

This article, originally posted May 4, has been updated to clarify the USPTO's action and to include Helicos' response to the reexamination of the '596 patent.

The US Patent and Trademark Office has rejected the claims of all four Helicos BioSciences patents that are part of an intellectual property dispute with Pacific Biosciences in a non-final action, granting a request from PacBio to reexamine the patents.

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