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 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
