4. Of the disclaimer.

43. The act of March 3, 1837 sect¹. 7, authorizes² any patentee who shall have, through inadvertence, accident, or mistake, made his specification³ of claim too broad, claiming more than that of which he was the original or first inventor, some material and substantial part of the thing patented being truly and justly his own, any such patentee, his administrators⁴, executors, and assigns, whether of the, whole or of a sectional interest therein, may make disclaimer of such parts of the thing patented as the disclaimant shall not claim to hold by virtue⁵ of the patent or assignment, stating therein the extent of his interest in, such patent; which disclaimer shall be in writing, attested⁶ by one or more witnesses, and recorded in the patent office, on payment by the person disclaiming⁷, in manner as, other patent duties are required by law to be paid, of the sum of ten dollars. And such disclaimer shall thereafter be taken and considered as part of the originals specification, to the extent of the interest which shall be possessed⁸ in the patent or right secured thereby⁹, by the disclaimant, and by those claiming by or under him subsequent to the record thereof. But no such disclaimer shall affect any action pending¹⁰ at the time of its being filed, except so far as may relate to the question of unreasonable¹¹ neglect or delay in filing the same.

5. Assignment of patents.

44. By virtue of the act of July 4, 1836, sect. 11, every-patent shall be assignable in law, either as to the whole interest, or, any undivided part thereof, by any instrument in writing; which assignment, and also every grant and conveyance¹² of the exclusive right under any patent, to make and use, and to grant to others to make and use, the thing patented within and throughout any, specified¹³ part or portion of the United States, shall be recorded in the patent office within three months from the execution thereof. This act required the payment of a fee of three dollars to be paid by the assignee, but this provison has been repealed¹⁴ by the act of March 3, 1839, s. 8, and such assignments, grants, and conveyances¹⁵, shall, in future, be recorded without any charge whatever. But, by the act of May 27, 1848, Minot's. Stat. at Large, U. S. 231, it is enacted¹⁶, That hereafter the commissioner¹⁷ of patents shall require a fee of one dollar for recording¹⁸ any assignment, grant or conveyance, of the, whole or any part of the interest in letters-patent, or power of attorney, or license¹⁹ to make or use the things patented, when such instrument shall not exceed three hundred words; the sum of two dollars when it shall exceed three hundred, and shall not exceed one thousand words and the sum of three dollars when it shall exceed one thousand words; which fees shall in all cases be paid in advance.

6. The extension of the patent.

45. The act of July. 4, 1836, sect. 18; directs, That whenever any patentee of an invention or discovery shall desire an extension of his patent beyond the term of its limitation, be may make application therefor, in writing, to the commissioner of the patent office, setting forth²⁰ the grounds thereof, and the commissioner shall, on the applicant's paying the sum of forty dollars to the treasury²¹, as in the case of an original application, for a patent, cause to be published, in one or more of the principal newspapers in the city of Washington, and in such other paper or papers as he may deem proper, published in the section of country most interested adversely²² to the extension of the patent, a notice of such application and of the time and place when and where the same will be considered, that any, person may appear and show cause why the extension should not be granted. And the secretary of state, the commissioner of the patent office, and the solicitor²³ of, the treasury, shall constitute a board to hear and decide upon the evidence produced before them both for and against the extension, and shall sit for that purpose at the time and place designated in the published notice thereof. The patentee shall furnish to said board a statement, in writing, under oath, of the ascertained²⁴ value of, the invention, and of his receipts and expenditures²⁵, sufficiently²⁶ in detail to exhibit a true and faithful account of loss and profit in any manner accruing²⁷ to him from and by reason of said invention. And if, upon a hearing of the matter, it shall appear to the full and entire satisfaction of said board, having due regard to the public interest therein, that it is just and proper that. the term of the patent should be extended by reason of the patentee, without neglect or fault on his part, having failed to obtain, from the use and sale of his invention, a reasonable remuneration for the time, ingenuity²⁸ and expense bestowed²⁹ upon the same, and the introduction thereof into use, it shall be the duty of the commissioner to renew and extend the patent, by making a thereon of such extension, for the term of seven years from and after the expiration³⁰ of the first term; which certificate, with a certificate of said board of their judgment³¹ and opinion as aforesaid, shall be entered on record in the patent office; and thereupon the said patent shall have the same effect in law as though it had been originally granted for the term of twenty-one years. And the benefit of such, renewal³² shall extend to assignees and grantees of the right to use the thing patented, to the extent of their respective interest therein: Provided, however, That no extension of a patent shall be granted after the expiration of the term for which it was originally issued.