What is an Interference Practice Specialist (IPS) and when should an examiner consult one?

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.

An Interference Practice Specialist (IPS) is an expert in each Technology Center (TC) who must be consulted when suggesting an interference to the Board. Examiners should consult an IPS when they first become aware of a potential interference or when any interference issue arises during prosecution of an application.

According to the MPEP, Examiners are expected to be proficient in identifying potential interferences and to consult with an IPS in their TC on interference matters. The MPEP further states that An IPS must approve any referral of a suggested interference to the Board.