What is the significance of the kind code in foreign patent documents?

This page is an FAQ based on guidance from the Manual of Patent Examining Procedure. It is provided as guidance, with links to the ground truth sources. This is information only: it is not legal advice.

The kind code in foreign patent documents is an important indicator of the document’s nature. The MPEP explains:

“The kind of document is indicated by the appropriate document code following the country code.“

Kind codes typically denote:

• The type of patent document (e.g., application, granted patent)
• The stage of publication
• Specific variations within a country’s patent system

Understanding kind codes is crucial for accurately identifying and citing foreign patent documents in USPTO proceedings.