Overview of the PPH procedure What constitutes a formal deficiency in a PPH request? Home Service & support Frequently Asked Questions (FAQ) Applying for a patent Patent prosecution highway (PPH) Overview of the PPH procedure What constitutes a formal deficiency in a PPH request? Facebook X Linkedin Email What constitutes a formal deficiency in a PPH request? A formal deficiency may be a clerical error or an omission in the request form which is rectifiable. Substantive deficiencies such as lack of claims correspondence cannot be rectified. Category Overview of the PPH procedure Go to FAQ overview