Classes in the U.S. Patent Classification System - Dates Established
Classes in the U.S. Patent Classification System with the dates they were established
Listed below are links to the various classes within the U.S. Patent Classification System with the date they were 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