The PTO registers individuals as agents
or attorneys who have passed the official "Examination for Registration
to Practice in Patent Cases before the US Patent & Trademark Office".
An individual who passes the exam is called a patent agent. Such
an individual who also provides proof of good standing in a state's
bar is called a patent attorney. Both individuals may file the
same papers so that you may obtain a patent. The primary difference
between an agent and an attorney is that an agent is not a lawyer and
as such may not engage in activities that their local jurisdictions
believe is "practicing law". Such activities might include
license agreements, because these are contracts, or engaging in patent
litigation. PTO
details
Note: Lawrence
R. Brandt is a Registered Patent Agent. Notice of Mr. Brandt's registration
to practice can be found on the PTO's web site, using this
link.