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Pursuant to 26 CFR 1.1235-2 (b) (1) [Title 26 Internal Revenue; Chapter I Internal Revenue Service, Department of the Treasury; Subchapter A Income Tax; Part 1 Income Taxes; Normal Taxes and Surtaxes; Capital Gains and Losses; Special Rules for Determining Capital Gains and Losses], the term all substantial rights to a patent means “all rights (whether or not then held by the grantor) which are of value at the time the rights to the patent (or an undivided interest therein) are transferred. The term all substantial rights to a patent does not include a grant of rights to a patent:
(i) Which is limited geographically within the country of issuance;
(ii) Which is limited in duration by the terms of the agreement to a period less than the remaining life of the patent;
(iii) Which grants rights to the grantee, in fields of use within trades or industries, which are less than all the rights covered by the patent, which exist and have value at the time of the grant; or
(iv) Which grants to the grantee less than all the claims or inventions covered by the patent which exist and have value at the time of the grant.
The circumstances of the whole transaction, rather than the particular terminology used in the instrument of transfer, shall be considered in determining whether or not all substantial rights to a patent are transferred in a transaction.”