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Searches based on patent classifications can identify documents of different languages by using the codes (classes) of the system, rather than words. Patent classification systems were originally developed for sorting paper documents, but are nowadays used for searching patent databases.
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is applied, and to track technological trends in patent applications.
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or other people to categorize (code) documents, such as published
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and design classification material is updated within the USPC.
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The United States Patent and
Trademark Office index patents by
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