Question from Mark A.:
What is an X-patent?
Prior to the Patent Act passed on July 4, 1836, patents were assigned by date and the name of the patentee. The Patent Act provided a system for numbering the patents. Patents issued before the Patent Act were renumbered in chronological order with an X after the number. The first patent every issued is now 1x.
Read more about X-patents and patent #1.
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