Mr. Justice McLEAN

delivered the opinion of- the court.

This case is before us, on a writ of error to the circuit court for the eastern district of Pennsylvania.

The action was brought for the infringement of a patent. The jury, under the instructions of the court, found a verdict for the defendant. Exceptions were taken to the rulings of the court, which present the points of law for consideration.

On the 6th of October, 1843, Joseph Battin obtained a patent for the invention of a new and useful improvement in the machine for breaking and screening coal.

After describing the different parts of the machine, he sums up by saying: having thus fully described the nature and operation of my machine for breaking and screening coal, what I claim as new therein,- and desire to secure by letters-patent, is, the manner in which I have arranged and combined with each other the breaking rollers and the screen; the respective parts being formed and operating substantially as herein set forth and made known.

An improvement to the above machine, by adding ah auxiliary roller, was patented to Battin, 20th January, 1844. And on the 12th of February, 1844, another patent was granted to *81 him, for a new and useful improvement in the machine for breaking coal.

In his specification, he says that he had made a new and useful improvement, in the manner of combining and arranging the toothed rollers used in the machine for breaking coal, which rollers, as combined and arranged by me, are described as follows, in the specification attached to letters-patent, for a machine for the effecting simultaneously the breaking and screening of coal, granted to me under date of .the 6th day of October, 1843 : The breaking part of my machine consists of two rollers of cast-iron, the peripheries of which are provided with teeth so placed as that, in the revolution of the rollers, the teeth of each of them shall stand opposite to the spaces formed by two contiguous teeth on the opposite roller. These rollers are geared together, in order to preserve the same relative position.

In the above-named letters he says: the manner of arranging and combining the toothed rollers was not made the subject of a claim, the said patent having been obtained for the combining of a roller-breaking machine, with a screen for separating the coal into the different sizes required; but as the breaking rollers, so formed and arranged and combined, are applicable to the. ordinary cylinder-breaking machine, when not used in combination with .a screen; and as I have found, by continued experiment, that such rollers constitute a real improvement in any breaking machine, I .have determined to secure to myself the benefit of such improvement, in a distinct and separate patent therefor. Rollers for the breaking of stone, of ores, of coal, of corn, and of other substances, have been frequently construeted, and are well known, &c.

And, he adds, having thus fully described the nature of my impro rement, in the manner of combining and arranging the toothed rollers used in the machine for breaking coal, what I claim therein ás new, and desire to secure by letters-patent, is, the so forming and gearing of such rollers, as that the teeth of one of them shall always be opposite to a space between the teeth in the other, whenever they are operating upon the article to be broken; the same being effected substantially in the manner herein set forth.

And afterwards, on the 4th of September, 1849, the said' Joseph Battin obtained a patent, in which it is stated that he had invented a new and useful machine for breaking coal, for which letters-patent were granted to him, dated October 6, 1843, to which was added an additional improvement, dated 20th January, 1844, and, said letters having been surrendered by him, the same have been cancelled, and new letters-patent have been ordered to issue to him, on an aménded specification. *82 He also surrendered the patent granted to him the 12th of February, 1844, for an improved machine for breaking coal, which patent is hereby cancelled, but. not reissued, &c.

After describing the invention, he sums up by saying: “What I claim, therefore, as my invention, and desire to séeure by letters-patent, is the arrangement of the teeth on the two rollers, substantially as herein described, so that in their relation the teeth of one shall come opposite the spaces between the teeth of the other, with sufficient space between to hold lumps of the required size, the rollers being so combined in gearing as to make them rotate in opposite directions, and, with the required velocities, to retain the relative position of the teeth of the two rollers, as described.”

In the 6th section of the patent act of 1836, it is declared that, “ before any inventor shall receive a patent, he shall deliver a written description of his invention, in such full, clear, and exact terms, as to enable any person skilled in the art or science to which it appertains, to make and construct the same; and, in ease of any machine, he shall fully explain the principle, and the several modes of the application of the machine, so that it may be distinguished from other inventions; and shall particularly specify and point out the part, improvement, or combination, which he claims as his own invention or discovery.”

And, by the 13th section of the same act, it is provided, “ that when a patent shall be inoperative or invalid, by reason of a defective or insufficient description or specification, or by reason of the patentee claiming in his specification, as his own invention, more than he had or shall have a right to claim as .new, if the error has or shall have arisen by inadvertency, accident, or mistake, and without any fraudulent or deceptive intention, it shall be lawful for the commissioner, upon the surrender to him of such patent, &c., to cause a new patent to be issued to the said inventor, for the same invention, for the residue of the period then unexpired, for which the qriginal patent was granted, in accordance with the patentee’s corrected description and specification. And the patent so issued shall have the same effect and operation in law, on the trial of all- actions hereafter commenced, for causes subsequently accruing, as though the same had been originally filed in such corrected form before the issuing of the original patent.”

In his charge to the jury, the district judge said: “ The case of Battin v. Clayton, which was before us some time ago, grew ■ out of an alleged infraction of this patent, of 1843. We held, on the trial of that case, that the patent being merely for the combination of machinery, it could neither be supported nor *83 assailed by proof of the novelty, or want of novelty, of the parts. The patent was thereupon surrendered, and a new one issued, on the 4th of September, 1849, under an amended specification, which described essentially the same machine as the former one did, but claimed, as the thing invented, the breaking apparatus only.”

And, he remarks: “ It is said that the present defendants are using the apparatus described in this reissued patent, and that they should be mulcted in damages, accordingly.” But there are two legal positions, of a general character, which appear to me to bar the plaintiff’s right of recovery. They are these : —

1. That a description, by the applicant, for a patent of a machine, or a part of a machine, in his specification, unaccompanied by notice that he has rights in it as inventor, or that he desires to secure title to it as a patentee, is a dedication of it to the public.

, 2. That such a dedication cannot be revoked, after the machine has passed into public use, either by surrender and reissue, or otherwise.

The above instructions, we think, were erroneous. ■

Whether the defect be in the specifications or in the claim-, under the 13th section above cited, the patentee may surrender his p'atent, and, by an amended specification or claim, cure the defect. The reissued patent must be for the same invention, substantially, though it be described in terms more precise and accurate than in the first patent. Under such circumstances, a new and different invention cannot be claimed. But where the specification or claim is made so vaguely as to be inoperative and invalid,, yet an amendment may give to it validity, and protect the rights of the patentee against all subsequent infringements.

So strongly was this remedy of the patentee recommended, by a sense of justice and of policy, that this court, in the case of Grant v. Raymond, 6 Pet. 218, sustained a reissued and corrected patent, before any legislative provision was made on the subject. In that case, the chief justice said: “ It will not be pretended that this question is free from difficulty. But-the executive departments, it is understood, have acted on the construction adopted by the circuit court, and have considered it as settled. We would not willingly disregard the settled practice, in a case where we are not satisfied. it is contrary to law, and where we are satisfied it is required by justice and good faith.” The same principle was sanctioned in the case of Shaw v. Cooper, 7 Pet. 310.

How much- stronger is a case under the statute, which secures the rights of the patentee by a surrender, and declares the effect *84 of the reissued and corrected patent ? By the defects provided for in the statute, nothing passes to the public from the specifications or claims, within the scope of the patentee’s invention. And this may be ascertained by the language he uses.

In the case of Stimpson v. The West Chester Railroad Company, 4 How, 380, it was held, that “ where a defective patent had been surrendered, and a new one taken out, and the patentee brought an action for a violation of his patent right, laying the infringement at a date subsequent to that of the reissued patent, proof of the use of the thing patented, during the interval between the original and renewed patents, will not defeat the action.” In the same case it was also held, that the proceeding before the commissioner, in the surrender and reissue of a patent, is not open for investigation, except on the ground of fraud.

The patent of 1843 was not surrendered on the obtainment of the patent of 1844. That was intended to be a new invention of arranging and combining the toothed rollers, which, the patentee says, was not made the subject of a claim in the patent of 1843. The patent of 1844 was cancelled, but not reissued, when the patent of 1849 was issued. . At that time, the patent of 1843, and the improvement thereon, dated January 20, 1844, were surrendered and cancelled, and new letters-patent. were issued on an amended specification.

The cause of the surrender of the patent of 1843, as stated in the charge to the jury, was the ruling of the court in the case of Battin v. Clayton, and that the amended patent of 1849 was. consequently obtained. That ruling is not now before us, nor is it necessary to inquire whether the patent of 1843, on 'thé specifications and claim, was sustainable. Thé plaintiff, by a surrender of that patent, and the procurement of the patent of 1849 with amended specifications, abandoned his first patent, and relied wholly on the one reissued. The claim and specifications in this patent, as amendatory of the first, were within the 13th section of the act of 1836. It is said, with entire accuracy, in the charge, in regard to the amended specification of the patent of 1849, that it “ described essentially the same machine as the former one did, but claimed, as the thing invented, the breaking apparatus only.” And this the patentee had a right to do. He had a right to restrict or enlarge his claim, so as to give it validity, and to effectuate his invention.

In the argument, the counsel very properly considered the patent of 1844 as not in the case. It was designed to secure a new combination, not included in the first patent; and as the patent of 1844 was surrendered and cancelled, and not reissued, *85 it being equally disconnected with the patent of 1843, and the reissued and corrected patent of 1849, it can have no effect on the claim óf the plaintiff.

We think the court also erred in saying to the jury, “We instruct you that your verdict, in each ease, must be for the defendants.”

This, as well as the two instructions above noticed, took from the jury facts which it was their province to examine and determine. It was the right of the jury to determine, from the facts in the case, whether the specifications, including the claim, were so precise as to enable any person skilled in the structure of machines, to make the one described. This the statute requires, and of this the jury are to judge.

The jury are also to judge of the novelty of the invention, and whether the renewed patent is for the same invention as the original patent; and they are to determine whether the invention has been abandoned to the public. There are other questions of fact which come within the province of a jury; such as the identity of the machine used by the defendant with that of the plaintiff’s, or whether they have been constructed and act on the same principle.

The judgment is reversed, and the cause is remanded to the circuit court for further proceedings.

Order.

This cause came on to be heard on the transcript of the record from the circuit court of the United States for the eastern district of Pennsylvania, and was argued by counsel. On consideration whereof, it is now here ordered and adjudged by this court, that the judgment of the said , circuit court in this cause be and- the same is hereby reversed, with costs; and that this cause be and the same is hereby remanded to the said circuit court; with directions to award a venire facias de novo.