What Is a Patent Examiner?

A patent examiner is the person at the patent office who reviews your application and decides whether your invention meets the requirements for a patent. They search the prior art, assess novelty and inventive step, evaluate whether the specification adequately describes the invention, and issue Office Actions explaining any rejections or objections.

Understanding who examiners are, how they work, and what motivates them makes you a more effective applicant.

What Examiners Do

The examiner's job is to ensure that only inventions meeting the legal requirements are granted patents. For each application assigned to them, the examiner:

Searches the prior art. Using patent databases, classification codes, and keyword searches, the examiner identifies published patents, patent applications, and non-patent literature that may anticipate or render obvious the claimed invention.

Assesses patentability. The examiner evaluates each claim against the requirements of the relevant patent law — novelty, inventive step (non-obviousness), industrial applicability (utility), enablement, and written description.

Issues Office Actions. If the examiner finds problems — prior art that anticipates or renders obvious the claims, unclear claim language, inadequate specification support — they issue a written communication explaining the rejections. The applicant then has an opportunity to respond with arguments, amendments, or both.

Conducts interviews. Most patent offices allow the applicant's attorney to speak directly with the examiner by phone or video. Examiner interviews are one of the most effective prosecution tools — a 20-minute conversation can resolve issues that would otherwise require months of written correspondence.

Decides allowance or final rejection. After one or more rounds of Office Actions and responses, the examiner either allows the claims (leading to grant) or issues a final rejection (which can be appealed).

How Examiners Are Organised

Patent offices organise examiners by technology area. The USPTO has approximately 8,500 examiners divided into Technology Centers (TCs), each covering a broad field — mechanical engineering, biotechnology, electrical engineering, computer architecture, and so on. Within each TC, Art Units specialise further.

Your application is assigned to an examiner based on its classification. You generally cannot choose your examiner — but you can research the examiner's track record after assignment. Tools like USPTO Patent Center, the Patent Examination Data System (PEDS), and third-party analytics platforms reveal an examiner's allowance rate, average prosecution length, and commonly cited prior art.

Working Effectively With Examiners

Request interviews. This is the single most effective tactical step available to applicants. Examiners generally welcome interviews because they reduce the number of written Office Action rounds — making both parties more efficient. Call before writing your response to understand the examiner's position and test potential amendments informally.

Be specific in your arguments. Examiners respond to precise, technical distinctions between your claims and the cited prior art. Generic arguments ("the references do not teach or suggest the claimed invention") are less effective than specific arguments that quote the claim language and the prior art side by side.

Understand the examiner's constraints. Examiners work under production quotas — they are measured on the number of applications they process. This creates pressure to resolve cases efficiently. An applicant who is clear, responsive, and focused makes the examiner's job easier — and easier cases tend to reach better outcomes.

Respond promptly. Waiting until the deadline to file responses adds months of dead time to prosecution. Prompt responses signal engagement and keep the application moving.

Sources

1. USPTO Patent Examining Corps — US Patent and Trademark Office examination division
2. MPEP § 713 — Examiner Interviews — Guidelines for applicant-examiner communications
3. EPO Guidelines for Examination — European examination procedures and examiner roles
4. CNIPA Examination Process — Chinese patent examination procedures