A year ago or so, the USPTO started a beta-test of its system in which docx files play an important role. In the best-test system, an applicant was permitted to file a patent application in docx format rather than PDF format. Likewise, the applicant had the opportunity to receive some documents from the USPTO in docx format in addition to PDF format. Our firm was among the beta-testers of this docx system.
Now, as of September 10, 2017, these features have been made available to all USPTO customers (not merely the beta-test users). This offers a new Best Practice for reporting to clients.

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