Massachusetts offers a corporate income tax deduction for (1) any income -- including royalty income -- received from the sale or lease of a U.S. patent deemed beneficial for energy conservation or alternative energy development by the Massachusetts Department of Energy Resources, and (2) any income received from the sale or lease of personal or real property or materials manufactured in Massachusetts and subject to the approved patent. The deduction is effective for up to five years from the date of issuance of the U.S. patent or the date of approval by the Massachusetts Department of Energy Resources, whichever expires first.