Seed Availability and Competition Act of 2004

Seed Availability and Competition Act of 2004 - Requires persons who seek to retain seed harvested from the planting of patented seeds to register with the Secretary of Agriculture and pay related fees.

Establishes in the Treasury the Patented Seed Fund.

Imposes a tariff equal to the difference in fees in any case in which: (1) genetically modified seed on which royalties or licensing or other fees are charged by the patent owner to U.S. purchasers is exported, and (2) no such fees, or lesser fee amounts, are charged to foreign purchasers of the exported seed.