Page:Federal Reporter, 1st Series, Volume 7.djvu/113

 BUCKAN V. M'jiESaON. 101 �J, P. Fitch, for plaintifiPs. �S. A. Duncan, for defendants. �Blatchpokd, C. J. These suits are brouglit for the in- fringement of re-issued letters patent No. 5,007, granted to Isabella Eames and Charles A. Seely, July 30, 1872, for an "improvement in the manufacture of soap," the original pat- ent having heen granted to Charles J. Eames and Charles A. Seely, May 28, 1867. The specification of the re-issue says that the invention is "a new and improved composition for soap." It proceeds: "The nature of our invention consists in a new soap compound, produced by incorporating carbolic and cresylic acids, either one or botb, with ordinary soap. These substances are well known for their useful properties, and we have found that, when combined with soap, the detergent value of the soap is improved, and the properties of the acids are not masked or destroyed. To enable others skilled in the art to make and use our invention we proceed to describe it in detail. By soap we mean any of the com- pounds of alkali with cil or fat which are known and used in the arts under that name. Our invention is applicable to all kinds of ordinary detergent soap, and to several saponaceous compounds prepared for medicinal use. We employ one of the following ways of incorporating carbolic acid and cresylic acid with the soap : First, the acid or acids is dissolved in the alkaline solution before the addition of fat; second, the acids are dissolved in the melted fat; or, third, the acids are mixed in with the finished soap by means of crutching or other mechanical device. From the nature of the case we do not limit ourselves to any specifie proportions of the car- bolic and cresylic acids to the soap. For a toilet soap, five to fifty drops of the acid to the pound of soap will be found to give satisfactory effects, while as much as ten to twenty- five per cent, of acid may be used with other soaps. We are aware that gas tar and the dead oil of gas tar, containing a small proportion of carbolic acid, have been made into emul- sions of a somewhat saponaceous character by means of alkalies and saponifiable fats; and we are also aware that the dead oil of gas tar was formerly sometimes known under ��� �