What are the different series of U.S. patents?
The different series of U.S. patents include: X-Series: Approximately 10,000 patents issued between 1790 and July 4, 1836. 1836 Series: Mechanical, electrical, and chemical patents issued since 1836, often called “utility” patents. Reissue Series: Reissue patents, numbered with “Re.” prefix. A.I. Series: Patents for Additional Improvements issued from 1838 to 1861. Plant Patent Series: Patents…
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