These causes present the question whether the state of Massachusetts may tax, as income, royalties received by one of her citizens for the use of patents issued to him by the United States. The Supreme Judicial Court of that state held such an imposition would amount to a tax upon the patent right itself, and was prohibited by the Federal Constitution. 257 Mass. 572, 154 N. E. 182. We agree with that conclusion.

The Constitution (article 1, § 8) empowers Congress 'to promote the progress of science and useful arts, by securing for limited times to authors and inventors the exclusive right to their respective writings and discoveries. * * *' The first Congress provided for issuance, in the name of the United States, of letters patent granting 'for any term not exceeding fourteen years, the sole and exclusive right and liberty of making, constructing, using and vending to others to be used, the said invention or discovery. * * *' Act April 10, 1790, § 1, c. 7, 1 Stat. 110.

Chapter 230, Act July 8, 1870, 16 Stat. 201 (Rev. Stat. § 4884; section 40, Title 35, U. S. Code (35 USCA § 43; Comp. St. § 9428)):

'Sec. 22. And be it further enacted, that every patent shall contain a short title or description of the invention or discovery, correctly indicating its nature and design, and a grant to the patentee, his heirs or assigns, for the term of seventeen years, of the exclusive right to make, use, and vend the said invention or discovery throughout the United States and the territories thereof. * * *'

Chief Justice Marshall, speaking for the court in Grant v. Raymond, 6 Pet. 220, 241, 242 (8 L. Ed. 376), stated the general purpose for which patents issue—

'To promote the progress of useful arts, is the interest and policy of every englightened government. * * * The subject was among the first which followed the organization of our government. It was taken up by the first congress. * * * The amendatory act of 1793 (1 Stat. 318) contains the same language, and it cannot be doubted, that the settled purpose of the United States has ever been, and continues to be, to confer on the authors of useful inventions an exclusive right in their inventions, for the time mentioned in their patent. It is the reward stipulated for the advantages derived by the public for the exertions of the individual, and is intended as a stimulus to those exertions. The laws which are passed to give effect to this purpose ought, we think, to be construed in the spirit in which they have been made. * * * The public yields nothing which it has not agreed to yield; it receives all which it has contracted to receive. * * *'

Kendall v. Winsor, 21 How. 322, 327, 328 (16 L. Ed. 165):

'It is undeniably true, that the limited and temporary monopoly granted to inventors was never designed for their exclusive profit or advantage; the benefit to the public or community at large was another and doubtless the primary object in granting and securing that monopoly.'

Bloomer v. McQuewan, 14 How. 539, 549 (14 L. Ed. 532):

'The franchise which the patent grants, consists altogether in the right to exclude every one from making, using, or vending the thing patented, without the permission of the patentee. This is all that he obtains by the patent.'

See, also, Paper Bag Patent Case, 210 U. S. 405, 423, 28 S. Ct. 748, 52 L. Ed. 1122; Bauer v. O'Donnell, 229 U. S. 1, 11, 33, S. Ct. 616, 57 L. Ed. 1041, 50 L. R. A. (N. S.) 1185, Ann. Cas. 1915A, 150.

The power to exclude others, granted by the United States to the patentee, subserves a definite public purpose-to promote the progress of science and useful arts. The patent is the instrument by which that end is to be accomplished. It affords protection during the specified period in consideration of benefits conferred by the inventor. And the settled doctrine is that such instrumentalities may not be taxed by the states.

In California v. Pacific Railroad Co., 127 U. S. 1, 8 S. Ct. 1073, 32 L. Ed. 150, the state sought to sustain a tax laid upon a franchise granted by the United States; but its power therein was denied. Through Mr. Justice Bradley this court said:

'Recollecting the fundamental principle that the Constitution, laws and treaties of the United States are the supreme law of the land, it seems to us almost absurd to contend that a power given to a person or corporation by the United States may be subjected to taxation by a state.'

The same general doctrine was approved by McCullouch v. Maryland, 4 Wheat. 316, 4 L. Ed. 579; Home Savings Bank v. Des Moines, 205 U. S. 503, 27 S. Ct. 571, 51 L. Ed. 901; Farmers, etc., Bank v. Minnesota, 232 U. S. 516, 34 S. Ct. 354, 58 L. Ed. 706; Choctaw & Gulf R. Co. v. Harrison, 235 U. S. 292, 35 S. Ct. 27, 59 L. Ed. 234; Indian Terr., etc., Oil Co. v. Oklahoma, 240 U. S. 522, 36 S. Ct. 453, 60 L. Ed. 779; Smith v. Kansas City Title & Trust Co., 255 U. S. 180, 41 S. Ct. 243, 65 L. Ed. 577; Gillespie v. Oklahoma, 257 U. S. 501, 42 S. Ct. 171, 66 L. Ed. 338; Clallam County v. United States, 263 U. S. 341, 44 S. Ct. 121, 68 L. Ed. 328; First National Bank v. Anderson, 269 U. S. 341, 46 S. Ct. 135, 70 L. Ed. 295; Jaybird Mining Co. v. Weir, 271 U. S. 609, 46 S. Ct. 592, 70 L. Ed. 1112; Northwestern Mutual Life Ins. Co. v. Wisconsin (November 21, 1927) 275 U. S. 136, 48 S. Ct. 55, 72 L. Ed. 202.

The courts of last resort in Pennsylvania and New York have held that a state may not tax patents granted by the United States. Commonwealth v. Westinghouse Elec. Mfg. Co., 151 Pa. 265, 24 A. 1107, 1113; People, etc., v. Assessors, 156 N. Y. 417, 51 N. E. 269, 42 L. R. A. 290. And no opinion to the contrary has been cited.

As United States patents grant only the right to exclude, our conclusion is not in conflict with those cases which sustain the power of the states to exercise control over articles manufactured by patentees, to regulate the assignment of patent rights, and to prevent fraud in connection therewith. Patterson v. Kentucky, 97 U. S. 501, 24 L. Ed. 1115; Webber v. Virginia, 103 U. S. 344, 26 L. Ed. 565; Allen v. Riley, 203 U. S. 347, 27 S. Ct. 95, 51 L. Ed. 216, 8 Ann. Cas. 137; John Woods & Sons Co. v. Carl, 203 U. S. 358, 27 S. Ct. 99, 51 L. Ed. 219; Ozan Lumber Co. v. Union County National Bank, 207 U. S. 251, 28 S. Ct. 89, 52 L. Ed. 195.

The challenged judgments are affirmed.

Mr. Justice HOLMES.

These are complaints brought by the respondent against the commissioner of corporations and taxation of Massachusetts, for the abatement of income taxes for the years 1921 and 1922. The question raised, as stated by the Supreme Judicial Court of the state, is whether the commonwealth has the right to tax the income received from royalties for the use of patents issued by the United States. That court held that the commonwealth had no such right under the Constitution of the United States, and the commissioner obtained a writ of certiorari from this court.

The reasoning of the court is simple. If the state 'cannot tax the patent, it cannot tax the royalties received from its use.' The postulate is founded on the casual intimation of Chief Justice Marshall in McCulloch v. Maryland, 4 Wheat. 316, 432, 4 L. Ed. 579, and is said to have been conceded below by the commissioner. It hardly is conceded here, and whether it is or is not, if this court should be of opinion that the conclusion urged by the commissioner can be supported upon broader grounds than he felt at liberty to take, the court is not estopped by his doubts. Why then cannot a state tax a patent by a tax that in no way discriminates against it? Obviously it is not true that patents are instrumentalities of the government. They are used by the patentees for their private advantage alone. If the government uses them, it must pay like other people. Richmond Screw Anchor Co. v. United States (Jan. 3, 1928) 275 U. S. 331, 48 S. Ct. 194, 72 L. Ed. 303. The use made by the patentee may be not to make and sell the patented article, but simply to keep other people from doing so in aid of some collateral interest of his own. Continental Paper Bag Co. v. Eastern Paper Bag Co., 210 U. S. 405, 422, 424, 28 S. Ct. 748, 52 L. Ed. 1122. National banks really are instrumentalities of the government and directly concern the national credit. Indians are wards of the nation. Interstate commerce is left expressly to regulation by Congress, and the states can intermeddle only by its consent. In this case the advantages expected by the government are mainly the benefits to the public when the patent has expired, and, secondarily, the encouragement of invention. Pennock v. Dialogue, 2 Pet. 1, 19, 7 L. Ed. 327. The most that can be said is that a tax is a discouragement so far as it goes, and to that extent in its immediate operation runs counter to the government intent. But patents would be valueless to their owner without the organized societies constituted by the states, and the question is why patents should not contribute as other property does to maintaining that without which they would be of little use.

Most powers conceivably may be exercised beyond the limits allowed by the law. Rights that even seem absolute have these qualifications. American Bank & Trust Co. v. Federal Reserve Bank of Atlanta, 256 U. S. 350, 358, 41 S. Ct. 499, 65 L. Ed. 983. But we do not on that account resort to the blunt expedient of taking away altogether the power or the right. Board of Trade v. Christie Grain & Stock Co., 198 U. S. 236, 247, 248, 25 S. Ct. 637, 49 L. Ed. 1031. The power to tax is said to be the power to destroy. But, to repeat what I just now have had occasion to say in another case, this court, which so often has defeated the attempt to tax in certain ways, can defeat an attempt to discriminate or otherwise to go too far without wholly abolishing the power to tax. The power to fix rates is the power to destroy, but this court, while it endeavors to prevent confiscation, does not prevent the fixing of rates. Even with regard to patents some laws of a kind that might destroy the use of them within the state have been upheld. Patterson v. Kentucky, 97 U. S. 501, 24 L. Ed. 1115; Webber v. Virginia, 103 U. S. 344, 26 L. Ed. 565; Emert v. Missouri, 156 U. S. 296, 15 S. Ct. 367, 39 L. Ed. 430. They must be reasonable, or they will be held void, but, if this court deems them reasonable, they stand. Allen v. Riley, 203 U. S. 347, 355, 27 S. Ct. 95, 51 L. Ed. 216, 8 Ann. Cas. 137.

The fact that the franchise came from a grant by the United States is no more reason for exemption, standing by itself, than is the derivation of the title to a lot of land from the same source. Tucker v. Ferguson, 22 Wall. 527, 22 L. Ed. 805. In Baltimore Shipbuilding & Dry Dock Co. v. Baltimore, 195 U. S. 375, 25 S. Ct. 50, 49 L. Ed. 242, the land was conveyed subject to a condition that a dry dock should be built upon it which the United States was to have the right to use free from charge for docking, and which was to revert to the United States on a diversion of the land to any other use or on the dry dock being unfit for use for six months, certainly a case in which the United States was much more clearly interested that in an ordinary patent. Yet there it was held that neither the company nor the land was an instrumentality of the United States, and that there was nothing to hinder the right of the state to tax. See further Forbes v. Gracey, 94 U. S. 762, 24 L. Ed. 313.

Mr. Justice BRANDEIS, Mr. Justice SUTHERLAND, and Mr. Justice STONE agree with this opinion.