USPC Class Details

Description: 318 electricity: motive power systems / 318 electricity: motive power systems/(560) positional servo systems (e.g., servomechanisms) (638) with particular "error-detecting" means

Hierarchy/Derived subclasses

318 / 560-> 638-> 639
  -> 640
  -> 641
  -> 642
  -> 643
  -> 644
  -> 645
  -> 646
  -> 647
  -> 648-> 649
  -> 650
  -> 651
  -> 652-> 653
   -> 654-> 655
   -> 656-> 657
    -> 658
    -> 659
    -> 660
    -> 661
   -> 662
   -> 663-> 664
    -> 665
    -> 666
    -> 667-> 668
   -> 669
   -> 670

uspto searches

Patent Apps in 318/638

Granted Patents in 318/638

Use the links above or do an advanced search in ppubs for:
(318/638.ccls. or 318/639.ccls. or 318/640.ccls. or 318/641.ccls. or 318/642.ccls. or 318/643.ccls. or 318/644.ccls. or 318/645.ccls. or 318/646.ccls. or 318/647.ccls. or 318/648.ccls. or 318/649.ccls. or 318/650.ccls. or 318/651.ccls. or 318/652.ccls. or 318/653.ccls. or 318/654.ccls. or 318/655.ccls. or 318/656.ccls. or 318/657.ccls. or 318/658.ccls. or 318/659.ccls. or 318/660.ccls. or 318/661.ccls. or 318/662.ccls. or 318/663.ccls. or 318/664.ccls. or 318/665.ccls. or 318/666.ccls. or 318/667.ccls. or 318/668.ccls. or 318/669.ccls. or 318/670.ccls.)

This will show what classes derive from the input. Ex: entering 43/42.24 shows the derived classes and the search that can be used to find patents or patent applications in those subclasses.
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