Chapter CCLXXVI. *to extend the Time of Letters Patent issued to Thaddeus Hyatt*
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CHAP. CCLXXVI.— An Act *to extend the Time of Letters Patent issued to Thaddeus Hyatt*. July 26, 1866. *Be it enacted by the Senate and House of Representatives of the United States of America in Congress assembled*, Patent of Thaddeus Hyatt for improvements in vault covers extended for seven years, upon condition. That the letters patent granted to Thaddeus Hyatt on the twelfth day of November, one thousand eight hundred and forty-five, for improvements in vault-covers, and which was reissued on the third day of April, one thousand eight hundred and fifty-five and subsequently extended by the commissioner of patents to the twelfth day of November, one thousand eight hundred and sixty-six, be, and the same is hereby extended for the term of seven years, commencing on the twelfth day November, one thousand eight hundred and sixty-six, and ending on the twelfth day of November, one thousand eight hundred and seventy-three, for the benefit of the said Thaddeus Hyatt, his heirs, and legal representatives, upon the condition hereinafter set forth.
And the commissioner of patents is hereby directed, upon the presentation of said patent, and the payment of the fees and charges provided by law, to extend said patent by making a certificate thereon, upon a certified copy thereof, of such extension in the name of the said Thaddeus Hyatt, if in his judgment upon full hearing, *that* the same should be granted. And the said commissioner is hereby further directed to cause said extension Effect of extension.if perfected to be entered on the record of the Patent Office.
And the said patent so extended shall have the same effect as if originally granted for the term extending to the end of the term to which it is extended by Proviso.this act: *Provided, however*, That said extended patent shall be open to legal inquiry and decision in the same manner as if issued under the general law relating to patents: *And provided further*, That all persons enjoying the lawful use of the improvement secured by said patent, and the purchaser of any machine so in use may continue to use the same as if this act had not passed.
Approved, July 26, 1866.