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==Table Variables==
Patent represents the patent number of each patent in question. Maintenance fees are paid in the fourth, eighth, and twelfth years of patent ownership. The feedate is the date each fee payment was received by the USPTO. Fees amounts vary between large, small, and micro firms as defined by the USPTO after the [[America Invents Act]] was enacted. [http://www.uspto.gov/learning-and-resources/fees-and-payment/uspto-fee-schedule] 3 corresponds to a large firm. 2 corresponds to a small firm. 1 corresponds to a micro firm.
A firm's [[Small Entity vs. Micro Entity]] status is often not the same for every patent it owns. Additionally, a firm's small or micro entity status may change in between maintenance fee patents. This change may be due to licensing and sharing patent interests with firms that do not also identify as small or micro or superseding firm size limits defined by the Code of Federal Regulations. Occasionally, a firm will pay two fees on the same day, typically due to having paid an earlier fee late.
==Table Purpose==
==Current Problems==
