Changes

==Table Variables==

The applicationid (also referred to as an application number) and pubno (patent publication number) correspond to the patent in question. Patent refers to patent number. The NBER two digit code assigns a patent to a sub-category of granted utility patents developed by the NBER. The USPC (U.S. Patent Classification) codes categorize patents based on similar subject matter. USPC_sub codes subdivide patents within the same USPC class into sub-categories based on structural, procedural, or functional differences. [http://www.uspto.gov/sites/default/files/patents/resources/classification/overview.pdf] The application date is the date the application was filed. THE pubdate is the date the patent was issued. The dispdate is the disposal date for the application and disptype gives the application status. ABN stands for abandoned. ISS stands for issued. PEN stands for pending. The priority date is the date of the earliest application filing that is given priority in determining the length of enforceability for the patent. Exp_date is the expiration date for the patent. Pta stands for patent term adjustment, which allows for a patent to be in force for a longer period of time, and extensions are counted in days. [http://www.uspto.gov/patent/laws-and-regulations/american-inventors-protection-act-1999/patent-term-guarantee-overview]

==Table Purpose==