Improved process for the manufacture of dental plates / [Jean Prosper Matheret].

  • Matheret, Jean Prosper.
Date:
1904
Catalogue details

Licence: Public Domain Mark

Credit: Improved process for the manufacture of dental plates / [Jean Prosper Matheret]. Source: Wellcome Collection.

    1/4
    N° 16,792 Date of Application, 30th July, 1904—Accepted, 22nd Sept., 1904 COMPLETE SPECIFICATION. Improved Process for the Manufacture of Dental Plates. I, Jean Prosper Matheret, of 8 Rue de Valois, Paris, France, Jeweller, do hereby declare the nature of this invention and in what manner the same is to be performed to be particularly described and ascertained in and by the following statement; — 5 This invention relates to an improved process for the manufacture of dental plates. According to this improved process an impression of the mouth is taken in wax. Of the exterior of this wax impression a plaster mould is taken, and from this plaster mould as a pattern two matrices are made, namely, one in 10 cast iron or cast steel the surface of which is made smooth by chiselling, and a second matrix which is produced by means of electro-deposition. The matrix produced by electro-deposition which consists of a sheet of copper constituting an exact reproduction of the aforesaid plaster mould, is strengthened by means of a filling or backing of zinc. IS The desired dental plate is now produced by employing these two matrices consecutively. For this purpose the gold plate which is to form the dental plate is first struck in the cast iron or steel matrix by means of three con¬ secutive dies of increasing hardness formed by means of the same matrix. A first die of lead is produced by striking a mass of lead in the cast iron 20 or steel matrix, and the gold plate is struck in the same matrix by means of the said first die. Then a sheet of copper is placed in this matrix, and is moulded on to the first leaden die. In this manner there is- produced a die composed of lead covered with copper. The gold plate is then struck with this die a second time in the cast iron or steel matrix. 26 Finally, a third die is made wholly of copper by striking a mass of copper heated to a white heat in the cast iron or steel matrix. The gold plate is struck with this third die first in the cast iron or steel matrix and then in the matrix obtained by electro deposition. In this manner a dental plate is produced which is an exact reproduction of the plaster mould made from the 30 impression in wax taken from the mouth. Having now particularly described and ascertained the nature of the said invention and in what manner the same is to be performed I declare that what I claim is; — The improved process for the manufacture of dental plates, which consists 35 in first making by means of a plaster mould made from the wax impression taken from the mouth, two matrices, one by casting cast iron or steel around the plaster, and the other by means of electro-deposition, the electro-deposited matrix being strengthened externally by means of a filling or backing of zinc or other material; then striking a gold plate successively in the two matrices 4p by means of consecutive dies of increasing hardness produced by casting or striking masses of lead and copper or other metals in the cast iron or steel matrix, substantially as described. Hated this 30th day of July 1904 For the Applicant, 45 F, WISE HOWORTH F.C.S., 46 Lincoln’s Inn Fields, London, W.C, Chartered Patent Agent, Redhill: Printed for Hia Majesty's Stationery Office, by Loye & Mgpcomson, Ltd,—1^04. [Price 8i.]