Can CPC symbols be changed during the patent examination process?

Yes, CPC symbols can be changed during the patent examination process. According to MPEP 909.01(a):

The examiner may change or add CPC symbols at any time during prosecution as appropriate.

Reasons for changing or adding CPC symbols may include:

  • Discovery of more relevant or specific CPC symbols during examination
  • Amendments to the claims that alter the invention’s scope
  • Identification of additional aspects of the invention requiring classification
  • Correction of initial classification errors

It’s important to note that while CPC symbols can be modified, significant changes to the controlling classification (first-listed symbol) may impact the examination process and potentially require transferring the application to a different art unit.

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Tags: classification changes, cpc symbols, Examiner Duties, patent examination