Chapter CDLIX. for the Relief of Frederick P
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CHAP. CDLIX.— An Act for the Relief of Frederick P. Dimpfel. June 10, 1872. *Be it enacted by the Senate and House of Representatives of the United States of America in Congress assembled, * That the patent heretoforePatent of Frederick P. Dimpfel extended. granted Frederick P. Dimpfel, on the sixteenth of July, eighteen hundred and fifty, for an improvement in steam-boilers, be, and the same is hereby, extended for seven years from and after the sixteenth of July, eighteen hundred and seventy-one: *Provided,* That all persons that have engagedProviso. in the use or manufacture of said invention, since the expiration of said patent, shall be authorized to continue the same notwithstanding the passage of this act.
Approved, June 10, 1872.