Classes in the U.S. Patent Classification SystemDates 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 2009.
- Classes G9B - 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