EPO - Discussion forums

Filter vs. query seems to work differently. For instance:
A query when filtered with CPC H02K1 gives 823 results, while an unfiltered query with AND cl = "H02K1" is added returns 1224 items.
This seems odd or wrong or it's just me...

Dear user,

Thank you for your question. There is a difference in the number of results because the field identifier "cl" searches for both the CPC and IPC symbols.

For example, a search for cl=H02K1 AND dual-rotor AND 2020 or for (cpc=H02K1 OR IPC=H02K1) AND dual-rotor AND 2020 gives the same result, i.e. 130 results today.

However, a search for CPC=H02K1 AND dual-rotor AND 2020 gives 91 results.

And a search for dual-rotor AND 2020 filtered with CPC=H02K1 gives also 91 results.

Kind regards,

Andrée
Patent Information Marketing