An Introduction to the Espacenet CPC Class Search Site

Pete Fenner, September 30 2022 - Patent Search

Espacenet CPC  Class Search Site:  Example search for carbon fiber fuel tank

Before 2019, the USPTO and many universities, including UT Austin, suggest you identify important keywords by “Brainstorming” your idea for related terms.  Then, you go to the USPTO Classification query page and enter the keywords. More details  on the UT  Library Patents, Trademarks, and Copyright page

Now Epacenet makes identifying possible CPC Class assignments for your Patent Application much easier.

Use our Espacent CPC Class Search database in our Express-V4 Patent Search subject Screens:

    1. “Paste or Type in just 3  or 5 top-level keywords for your idea. More than that may not find any CPC Classes. If this CPC Class search returns “No Results” then try removing one Keyword at a time until it does return resulting Classes. “No Results” means that one or more Keywords do not appear anywhere in a CPC Class or sub-class.
    2. Click the Espacenet CPC Class Search button and the example keywords to use in database searches – We tried this example using all 5 Keywords, thinking it would not give any results, but it did:I Express-V4.2 Patent Search Databases Screen showing Espacenet CPC Class Search Express-V4.2 Patent Search Databases Screen showing Espacenet CPC Class Search with Keywords – Carbon Fiber Liquid Fuel Tank
    3. When the  Espacenet CPC Class “Search” button is clicked, the related CPC Classes screen will display in a separate browser tab.

      Searc Results screen for Espavenet CPC terms carbon fiber liquid fuel tank
      CPC Classes Search Results using carbon fiber liquid fuel tank
    4. You may click on a particular Sub-Class link and see it sub-classes.  For example, the sub-classes of highlighed B32B 2605/00 display screen looks like: