The Classification Orders Index contains all the changes that have occurred to the classes within the U.S. Patent Classification System (USPCS).  The Classification Orders Index is updated quarterly in March, June, September, and December.  Links to classes within the Classification Orders Index are below.

• Classes 2-7
• Classes 8-15
• Classes 16-29
• Classes 30-38
• Classes 40-52
• Classes 53-61
• Classes 62-71
• Classes 72-81
• Classes 82-96
• Classes 98-106
• Classes 108-119
• Classes 122-131
• Classes 132-145
• Classes 148-157
• Classes 159-168
• Classes 172-181
• Classes 182-197
• Classes 198-210
• Classes 211-226
• Classes 227-240
• Classes 241-250
• Classes 251-260
• Classes 261-272
• Classes 273-283
• Classes 283-295
• Classes 296-307
• Classes 308-331
• Classes 332-342
• Classes 343-354
• Classes 355-363
• Classes 364-370
• Classes 371-382
• Classes 383-403
• Classes 404-415
• Classes 417-424
• Classes 425-435
• Classes 436-494
• Classes 501-520
• Classes 521-532
• Classes 534-549
• Classes 552-602
• Classes 604-709
• Classes 710-987
• Classes D01-D06
• Classes D07-D11
• Classes D12-D20
• Classes D21-D34
• Classes D35-D99
• Class PLT

KEY: =online business system =fees =forms=help =laws/regulations =definition (glossary)

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