Valuable Patents are annually expiring which might be extended and bring fortunes to the households of many a poor Inventor or his family. We have had much experience in procuring the extension of Patents; and as an evidence of our success in this department we would state were unsuccessful from causes entirely beyond our control. It is important that extension cases should be managed by attorneys of the utmost skill to insure success. All documents connected with extensions require to be carefully drawn up as any discrepancy or un truth exhibited in the papers is very liable to defeat the application. Of all business connected with Patents it is most important that extensions should be intrusted only to those who have had long expe rience and understand the kind of evidence to be furnished the Patent Office and the manner of presenting it. The heirs of a deceased Pat entee may apply for an extension. Parties should arrange for an ap plication for an extension at least six months before the expiration of the Patent. For further information as to terms and mode of procedure in ob taining an extension address MUNN & CO. No. 37 Park-row New York. We are prepared to undertake the investigation and prosecution of re ected cases on reasonable terms. The close proximity of our Wash ngton Agency to the Patent Office affords us rare opportunities for the examination and comparison of references models drawings docu ments Ac. Our success in the prosecution of rejected cases has been very great. The principal portion of our charge is generally left de pendent upon the final result. All persons having rejected cases which they desire to have prose cuted are invited to correspond with us on the subject giving a brief history of their case inclosing the official letters &c. The annexed letters from the last three Commissioners of Patents we commend to the perusal of all persons interested in obtaining Pat ents: Messrs. Mum & Co. :—I take pleasure in stating that while I held do
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