HOW TO OBTAIN LETTERS PATENT FOR NEW INVENTIONS Information about Caveats, Extensions, Interferons, Designs, Trade Marks; also, Foreign Patents. For period of nearly twenty-five years, MUNN&CO. have (occupied the position of leading Solicitors of American and European Piitents, and during this cxtended experience of nearly a quarter of a ccntui-ythey have examined not less than fifty thousand alleged new invention and have prooecuted upward of thirty thousand applications for patenta, and, in sid. dition to this, they have made, at the Patent Office. ovcr twenty thousand preliminary examinations into the novelty of inventions with a careful report on the same. The important advantages of MUNN&CO.'S Agency are, that their practice has been ten-fold greater than that of any other Agency In existed, with the additional advantage of having the assistance of the best: profras- ional skill in every department, and a Branch Office at WasMogton, winch watches and supervises, when necessary, cases as Mioy pass ttirooah officii^ examination. CONSULTATIONS AND OPINIONS FREE. Those who have made inventions and desire fir consultation are cordially- invited to advisc with MUNN&CO.who will be happy to see them in person at the office, or to advise them by letter. In all cases, they nily c::.:pect aii HOnest opinion. For such consultations, opinion, und advice, iro is. made. A pen-and-ink sketch and a description cf tho mvcnt.on should bc sent. TO APPLY FOR A PATENT, Amodelmustbcfurnished, not ©vcr a foot in any dimension. Send model to MUNN'& CO.,"7Park Eow, New Yori;,by express, charges paid, also, a description of the improvement, and remit $16 to coyer first Government fee, and revenue and postage stamps. The model should be neatly made, of any suitable materials, strongly fastened, without glue, and neatly painted. The name. of the inventor should be engraved or pointed upon it. When the invention consists of un improvement upon some o'mer machine, a full working model of the whole machine will not be necoasary. But the model must be sufficiently perfect to show with clearness the nature and op eration of the improvement. PRELIMINARY EXAMINATION Is made into the novelty ofaii invention by personal search at the Patent Oflice,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 l ong experience. MUNN&CO. wish It distinctly understood, that inventors who employ them are not required to incur the cost of a preliminary examination. This examination is only advised in more doubtful cases. COST OF APPLICATIONS, When the model is received, and first Government fee pMd, the dra-wings: and specification are carefully prepared and forwarted to the iirpUcart for his Signature and oatb, at which time the agency fee is kiUm! tor. This f<3e is general1y not over ®S. The cases are exceptionally complex if a higher fee than $25 called for,and ,upou the return of the papens they are filed at the Patent Office to await Official examination. If the case should be rejoct- ed for any «iuso,or objections made to a claim,the reasons are inquired tato anil communicatcd to tlie applicant, with sketches and explanations of toe rcfercnccs ; a:1(1 sl-Kiuid it appear that the reasoDS given are insufficient,the claima are prosceatcd immediately, and the rejection set aside, and usually Without Extra Charge to the Applicant, MUNl'!&CO, are determined to place within the reach of thosc who c°n' fide to them their business, the best facilities and the highest protasaraa1 skill and experience. The only ca»- - «nis character,in which MUNN&CO. expect an extra fee. l-l"' ...^e wherein appeals are taken from the decision of the Examiner a second rejection ; and 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 ali facts and charges, and no proceedings are had without his sanction ; so that all inventors who employ MUNN&CO, know in advance what their applications and patents are to cost. MUNN&CO. make no chargc for prosecuting the rejected claims of their own clients before the Examiners and when their patents are granted, the invention is noticed editoriallyin the Scientific American. REJECTED CASES. MUNN&CO. give very special attention to the examination ana prosecution ofrejected cases filed by inventors and other attorneys. ta fra^i cases a foe of $5is required for sp ecial examination and report, and m case ofprobable success by further prosecution, and the papers are found Mei-- ably well prepared, MUNN .&Co. will take up the case and endeavor to get it through for a reasonable fee,to beagrced upon in advance of pros ecution CAVEATS Are desirable ifan inventor is not fully prepared to apply for a Patent;. A Caveat affords protection, for one year, against the issue ofapatent to another for the same invention. Caveat papers should be carefully prepared. TheGovernmentfee on filing a Caveat is $10,and Munn&Co.'s charges f!!l1!.eparing the necessary papers are usually from $10 to $12. REISSUES. A patent when discovered to bc defective, may be reissued by thesurren- der of the original patent, and the filinr:; of amended papers. This proceeding should be taken with great care. DESIGNS, TRADE MARKS, AND COMPOSITIONS Can be patented for a term of years, also, new medicines or medical compounds, and useful mixture. of all kinds. When the invention consists ofa medicine or compound, or a new article of manufacture, or a new composition, samples of the article must be furnished, neatly put up. Also, send a ful1 statement of the ingredients, proportions, mode of preparation, uses ,and merits. PATENTS CAN BE EXTENDED. A11 patentsissued prior to 1801, and nowin force, maybe extended fora pCTtod afseven yeo upon tie presentation of proper testimony. The extended term of a” ,ent is frequently of much greater value than the first term ; but an ap .lcation for an extension, to be successful, must be care- :tUlly prepared Mcnn&Co. have had a large experience in obtaining extensions, ane' .re prepared to give reliable advice. INTERFERENCES Between' ::nding applications before the Commissioners are managed and testimray taken; also, Assignments, Agreements, and Licenses prepared. In fact, there Is no branch of the Patent Business which MTOTN&Co. are not fnlly prepared to undertake and manage with fidelity and dispatch. ' FOREIGN PATENTS. American inventors should bear in mind that fl ve PatentS-American, English, Fmm^ Belgian, and Prussian-will secure an inventor exclusive monopoly to his discovery among OnE HUNDRED and THIRTY KILMMS of the most rntismgrat people in the world. The facilities of business and steam communication are such, that patents can be obtained abroad our citizens almost as easily as at home. MUNN&CO. have prepared and taken alarger number °f European Patents than any other American Acicuey They have Agents of great experience in London, Paris, Berlin, and°otlier Capitals. A Pamphlet, containing a synopsis of the Foreign Patent Laws, gent f-.-e Addr«68MUNN&CO., 87 Park Row, Sew'York?'