On the petition of Desire Buck, administra trix of Darius Buck, deceased, of Albany, N. Y., praying for the extension of a patent granted to him on the 20th of May, 1839, for an improvement in cooking stoves, for seven years from the expiration of said patent which takes place on the 20th day ot May, 1853. It is ordered that the said petition be heard at the Patent Office on Monday, the 11th of April, 1853, at 12 o'clock M. ; and all per- sons are notified to appear and show cause, if any they have, why said petition ought not to be granted. Persons opposing the extension are required to file in the Patent Office their objections, specifically set forth in writing, at least twen ty days before the day of hearing; all testimo ny filed by either party to be used at the said hearing, must be taken and transmitted in ac cordance with the rules of the office, which will be furnished on application. S. H. HODGES, Com. of Patents. Washington, Dec. 12, 1852.