Step 2

If you click on the class or subclass number listed next to an item in the Index, it will take you to a new page listing the class at the top and the subclasses underneath.

  1. Take a look at the subclasses listed under the class to determine if they are related to invention you are looking for.

If you find one that you think applies, proceed to step 3. If not, go back to the Index and try another word or phrase.

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