The Patent Search Room is open from 8 a.m. to 8 p.m. weekdays and may be used by anyone at no charge. The device, discovery or process described in a patent cannot be manufactured, used or sold except by the inventor or assignee for 20 years after the date of patent filing, after which it enters the public domain. However, technical information contained in a patent can be used in many other ways. Copies of trademarks are available for a fee, or may be examined in the trademark public search library. The Trademark Search Library contains a copy of every registered U.S. Trademark and pending drawings for a registered mark.
All trademarks are available in cross-referred, alphabetical and design sections.