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

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

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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.

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•   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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