How to Obtain Letters Patent for New Inventions Information about Caveats, Extensions, Interferences, Designs, Trade Marks; also, Foreign Patents. FOR a period of nearly twenty-flve years, MUNIT CO. have occupied the position of leading Solicitors of American and European Patents, and during this extended exDCrience of nearly a quarter of a century, they have examined not less than fifty thousand alleged new inventions, and have prosecuted upwards of tlitrty nhousand applications for patents, and, in addition to this, the? have made, ac the Patent Office, over twenty thousand preliminary examinations into the novelty of inventions, with a careful report on the same. The important advantages of MUNT CO.'S Apency are.that their practice has been ten-fold greater than any other Asrency in existence, with the additional advantage of having the assistance of the best professional skill in every department ,and a Branch Office at Washington, which watches and supervises, when necessary, cases as they pass through official examination. MUNN CO. ask Special Attention to their SYSTEM OF DOING BUSINESS. CONSULTATIONS AND OPINIONS FREE. Those who have made inventions and desire to consult with us are cor-diallyinvited to do so. We shall be happy to see them in person at our office.or to advise them by letter. In all cases, they may expectf rom us an HONEST OPINION. For such consultations, aninion, and advice, WE MAKS NO CHARGE. ? pen-and-ink sketch and a description of tho invention should be scut, TO APPLY FOR A PATENT, A model must be furnished, not over afoot in any dimension. Send model to MUNN CO., 37 Park Row, Now ork,by express, charges paid, also, a a description of the improvement, and remit $16 to cover first Government fee, and revenue and postage stamps. The model should De neatly made, of any suitable materials, strongly fastened, without glue, and riatly painted. The name of the inventor should BE engraved or painted upon it. When the invention consists of an improve" ment upon some other machine, a full working model of the whole machine will not be necessary. But tne model must "be sufficiently perfect to show with clearness the nature and operation of the improvement. PRELIMINARY EXAMINATION le made into the novelty ?G an invention Dy personal search at the Patent Office, which embraces all patented inventions. For this special search and report, in writing, a fee of $5 is charged. This search is made by a corps of examiners of long experience. MUNN CO. wish it distinctly understood, that inventors who employ them are not required to incur the cost of a preliminaryexamination. This examination is only advised in more doubtful cases. COST OF APPLICATIONS. When the model is received, and first Government fees paid, the drawings andspecification are carefully prepared and orwarded to theapplicant for his signature ap.d oath, at which time the agency fee is called for. This fee is generally not over $25. T!ic cases are exceptionally complex if a higher fee than @25 is called for, and. upon the return of the papers, they are filed at the Patent Office to await OfllciST examination. If the case should be reject, ed for any cause.or objections made to a claim, the reasons are inquired into and communicated to the applicant, witn sketches and explanations of the references * and should it appear tnat the reasons given are insufficient, the claims are prosecuted immediately, and the rejection set aside, and usually with No Extra Chars:? to tne Applicant. MUNN CO. are determined to place" within the reach of thOBe who con Sfle to them their business, the best facilities and the highest professional skill and experience. The only cases of this character, in which MUNN CO. expect an extra fee, are those when appeals are taken from the decision of the Examiner after a second rejection ; atid MUNN CO. wish to state very distinctly,that they have but few cases which can not be settled without the necessity of an appeal ; and before an appeal is taken, in any case, the applicant is fully advised of all facts and charges, and no proceedings are had without his sanction ; so that al) inventors who employ MUNN Co. know in advance what their applications and patents are to cost. MUNN CO. make n charge or prosecuting the rejected claima of their own clients before the iixaminers; and when their patents are granted, the invention is noticed editorially In the SCIENTIFIC AMERICAN. REJECTED CASES. MUNN CO. give very special attention to the examination and prosecution of rejected cases nlcd Dy inventors and other attc-neys. In such cases a fee of $5 is required for special examination and report, and in case of probable success by further prosecution, and the papers are found tolerably well prepared, MUNN Co. will take up the case and endeavor to get it through fora reasonable l#e.agreed upon in advance of prosecution. CA EATS Are desirable it an inventor is not fufly prepared to apply for a Patent. A Caveat affords protection, for one year, against the issue of a patent to an other for the same invention. Caveat jpapers should be carefully prepared The Government fee on filing a Caveat is $10, and MUNN Co.'s charge for preparing the necessary papers are usually from $i0 to $12. REISSUES. A parent when discovered to be defective, may b e reissued by the surren der of the original patest, ana me nling of amended, papers. This proceed-ingshouldbe taken with great care. DESIGNS, TRADE ITS ASKS, AND COMPOSITIONS Can be patented fora term i y irs. also, new medicines or medical compounds, and useful mixtures of all kinds, v~hen the invention consists of a medicine or compound, a new article of manufacture, or a new compo* sition, samples of tho article must be furnished, neatly put up. Also, send us a full statement of the L"Tedients, proportions, mode of preparation, uses, and merits. PATENTS CAN BE EXTENDED. All patents issued prior to 1861, and now in force, mar be extended fora period of seven years upoa the presentation of nroper testimony. The extended term of a patent is frequently of much greater value than the first term ; but an application for an extension, to be successful, must be care" fully prepared. MUNN Co. have had a large experience in obtaining ex tensions and are prepared to.give reliable advice. INTERFERENCES Between pending applications before the Commissioners are managed and testimony taken; also, Assignments, Agreements, and Licenses prepared. In fact, there is no branch ol tho Patent Business which MUNN Co. are not fully prepared to undertake and manage withudelity and dispatch. FOREIGN PATENTS. American inventors should bear in mind that five Patents—American,English, French, Belgian, and Prussian—will secure an inventor exclusive monopoly to his discoyery among ONB HUNDRED AND THIRTY MILLIONB of the most intelligent people n he world. The iacilities of business and steam communication are such, that patenta can be obtained abroad by our citizens almost as easily as at home. MUNN Co. have prepared and taken a larger number ot European Patenta than any other American Agency. They have Agents of great experience in London, Paris,Berlin, and other Capitals. A Pamphlet, containing a synopsis of the Foreign Patent Laws, sent free. Address MUNN CO., 3T Park Row. New York.