The USPTO is hosting free public seminars on filing US patent applications in the DOCX format.
The first DOCX Information Session is 11 am - noon on Wednesday, November 13 (PST).
The USPTO says DOCX as an efficient way to file a patent application in structured text and plans to explain the DOCX format, how you can use it, and its benefits.
The USPTO says "a problem" is the abstract, specification, and claims reside in three files. PDF files can be combined in seconds (click three boxes in PAIR) so maybe a solution in search of a problem, but I will update if there is a more significant advantage to this filing format.
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