(a) Maintenance fees as set forth in §§ 1.20 (e) through (g) are required to be paid in all patents based on applications filed on or after December 12, 1980, except as noted in paragraph (b) of this section, to maintain a patent in force beyond 4, 8 and 12 years after the date of grant. (b) Maintenance fees are not required for any plant patents or for any design patents. (c) The application filing dates for purposes of payment of maintenance fees are as follows: (1) For an application not claiming
(a) The patentee may pay maintenance fees and any necessary surcharges, or any person or organization may pay maintenance fees and any necessary surcharges on behalf of a patentee. A maintenance fee transmittal letter may be signed by a juristic applicant or patent owner. A patentee need not file authorization to enable any person or organization to pay maintenance fees and any necessary surcharges on behalf of the patentee. (b) A maintenance fee and any necessary surcharge submitted for a patent