A "patent practitioner" is licensed to practice patent law before the USPTO and is a member of the bar – or so called 'patent bar'. A practitioner may either be a patent attorney or patent agent. Both patent attorneys and patent agents have the same license to practice and represent clients before the Patent Office without distinction – that is, there is no privilege afforded a patent attorney over a patent agent and both are recognized the same in all procedures of the United States Patent and Trademark Office (USPTO). Both patent agents and patent attorneys may prepare, file, and prosecute patent applications. Patent agents and patent attorneys may also provide patentability opinions, as noted by the U.S. Supreme Court in Sperry v. Florida. However, the USPTO" title="USPTO">USPTO Rules of Ethics and Professionalism, effective as of September 15, 2008, specifically clarifies that patent agents may not provide an "opinion of validity of another party's patent when the client is contemplating litigation and not seeking reexamination". Litigation is a matter of law before either of the 50 states – but not the patent office. If an opinion of validity is related to patent reexamination, a patent agent may provide this opinion.
Patent attorneys must also be admitted to the practice of law in at least one state or territory of the U.S. In the time since the USPTO" title="USPTO">USPTO issued the first patent in 1790, approximately 62,000 citizens have passed the USPTO registration examination, allowing them to be registered to prosecute patent applications. Today, about 38,000 people are on the list of registered patent attorneys and agents, with slightly less than 29,000 of them also licensed to practice law. Of the states, California has the most patent practitioners, followed by New York and Texas . Per capita, Delaware has more patent agents and attorneys than any state. Both patent agents and attorneys are generally required to have a technical degree (such as engineering, chemistry or physics) and must take and pass the Examination for Registration to Practice in Patent Cases Before the United States Patent and Trademark Office. Since patent attorneys are admitted to practice law in a state or territory, they can additionally provide legal services outside the Patent Office if practicing within the jurisdiction they are admitted to practice or if the law of the jurisdiction otherwise permits them to practice although not admitted in that jurisdiction.
In order to be registered as a patent agent or patent attorney, one must pass the USPTO_registration_examination" title="USPTO registration examination">USPTO registration examination. This exam, commonly referred to as the "patent bar," tests a candidate's knowledge of patent law and USPTO policies and procedures as set forth in the Manual of Patent Examining Procedure (MPEP). Upon successful completion of the examination, one will be labeled as a "patent attorney" if he/she has already been admitted to a state or territorial bar. However, engineers, scientists and any other science based majors, as well as law students and law graduates who are not admitted to a bar, will be labeled as "patent agents" since they cannot give legal advice nor represent clients in court. The latest exam result statistics are from June 9, 2005 through October 17, 2006: during that time, 58.2% of the 4,165 candidates passed the exam, which was based upon MPEP, 8th Edition, Revision 2. The current exam is based on MPEP, 8th Edition, Revision 4, as of October 19, 2006. (No tests were given based upon MPEP, 8th Edition, Revision 3.) Applicants who are not United States citizens and do not reside in the U.S. are not eligible for registration except as permitted by 37 CFR § 11.6(c). None of the world's countries except Canada reciprocates to U.S. citizens the right which the U.S. grants to their citizens.
A candidate must also have an adequate scientific and technical background or education to understand a client's invention. The educational requirement can be met by a bachelor's degree in a specifically enumerated major, such as Biology, Computer Science, Chemistry, Biochemistry, Microbiology, Physics, and Biomedical, Chemical, Civil, Electrical or Mechanical Engineering. This is known as Category A qualification. One can also meet the scientific and technical training requirement by qualifying under Category B or Category C. Category B provides four distinct qualification options, where each option sets a requisite number of semester hours in physics, biology, chemistry, computer science, and/or engineering. One can qualify under Category C by showing that he or she has taken and passed the Fundamentals of Engineering (FE) examination. Specific details of the ways in which one can qualify for the USPTO registration examination are outlined in the USPTO Registration Statement. Degrees in the social sciences, mathematics, or philosophy by themselves do not meet this requirement.
A candidate must also possess "good moral character and reputation" (37 CFR 11.7). If practicing outside the United States, a patent agent or patent attorney must be a U.S. citizen.