Classes in the U.S. Patent Classification System

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Patents > Office of Patent Classification > Classes in the USPCS: Dates Established

Classes in the U.S. Patent Classification System Dates Established

Listed below are the current classes in the U.S. Patent Classification System and the date each class was established. This information is complete through 2007.

Classes Plants - 49

Classes 51 - 89

Classes 91 - 131

Classes 132 - 173

Classes 174 - 210

Classes 211 - 245

Classes 246 - 291

Classes 292 - 318

Classes 320 - 355

Classes 356 - 386

Classes 388 - 426

Classes 427 - 473

Classes 474 - 532

Classes 534 - 987

Classes D1 - D99

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