IMPROVEMENTS IN PLATES FOR ARTIFICIAL TEETH
Year: 1862

page_text: LETTERS PATENT to Matthew Cartwright, of Hoxton, in the County of
Middlesex, Dentist, for the Invention of "IMPROVEMENTS IN PLATES FOR
ARTIFICIAL TEETH."
Sealed the 13th April 1863, and dated the 14th October 1862.
PROVISIONAL SPECIFICATION left by the said Matthew Cartwright at the
Office of the Commissioners of Patents, with his Petition, on the 14th
October 1862.
I, MATTHEW CARTWRIGHT, of Hoxton, in the County of Middlesex, Den-
tist, do hereby declare the nature of the said Invention for "IMPROVEMENTS.
IN PLATES FOR ARTIFICIAL TEETH," to be as follows:-
My Invention consists in combining leaf gold or finely precipitated gold
with india-rubber or gutta percha for the purpose of forming plates for arti-
ficial teeth; also in making plates for artificial teeth of india-rubber or gutta
percha combined with silica. I first grind the silica to an impalpable powder,
and stir, incorporate, and mix it with the india-rubber or gutta percha while
in a plastic state.
My Invention further consists in forming plates of a combination of sul-
phuret of zinc and kaolin, which after being reduced to a liquid state is applied
in successive layers upon the model of the plate to be produced until a
sufficiently thick plate composed of such layers is formed. In some cases, for
affording additional strength to the plates, I introduce some fibrous material
or metal gauze.

page_text: Lastly, my Invention consists in building up or forming plates for artificial
teeth by coating a model of the plate to be produced with successive layers
of gutta percha alone or combined with other substances until a sufficiently
thick plate has been formed. I allow every coat or layer to set and become
hard before applying the next, and then submit the finished plate to any
curing process that may be necessary to make it sufficiently hard for
wear.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said Matthew Cartwright in the Great Seal Patent Office on the
14th April 1863.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, MATTHEW
CARTWRIGHT, of Hoxton, in the County of Middlesex, Dentist, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Fourteenth day of October, in the year of our Lord
One thousand eight hundred and sixty-two, in the twenty-sixth year of Her
reign, did, for Herself, Her heirs and successors, give and grant unto me,
the said Matthew Cartwright, Her special licence, that I, the said Matthew
Cartwright, my executors, administrators, and assigns, or such others as I,
the said Matthew Cartwright, my executors, administrators, and assigns,
should at any time agree with, and no others, from time to time and at all
times thereafter during the term therein expressed, should and lawfully
might make, use, exercise, and vend, within the United Kingdom of Great
Britain and Ireland, the Channel Islands, and Isle of Man, an Invention
for "IMPROVEMENTS IN PLATES FOR ARTIFICIAL TEETH," upon the condition
(amongst others) that I, the said Matthew Cartwright, my executors or ad-
ministrators, by an instrument in writing under my, or their, or one of
their hands and seals, should particularly describe and ascertain the nature of
the said Invention, and in what manner the same was to be performed, and
cause the same to be filed in the Great Seal Patent Office within six calendar
months next and immediately after the date of the said Letters Patent.
NOW KNOW YE, that I, the said Matthew Cartwright, do hereby
declare the nature of my said Invention, and in what manner the same
is to be performed, to be particularly described and ascertained in and by
the following statement thereof, that is to say:
My Invention consists in combining leaf gold or finely precipitated gold
with india-rubber or gutta percha for the purpose of forming plates for arti-

page_text: ficial teeth. I first dissolve the india-rubber or gutta percha and grind the
gold leaf with the samo in order effectually to combine the metal with tho
gum used. I afterwards heat this compound to render it plastic, and shape
the plate by working it over or into a mould or model of the plate to be
produced.
My Invention further consists in forming plates of a combination of
sulphuret of zinc and kaolin, which after being reduced to a liquid state is
applied in successive layers upon the model of the plate to be produced until
a sufficiently thick plate composed of such layers is formd. In some cases,
for affording additional strength to the plates I introduce some fibrous material
or metal gauze.
And having now described the nature of my said Invention, and in what
manner the same is to be performed, I declare that I claim,-
First, manufacturing plates for artificial teeth of a composition of gold and
gutta percha or india-rubber in manner herein-before described.
And, second, manufacturing plates for artificial teeth of a composition of
sulphuret of zinc and kaolin as herein-before described.
In witness whereof, I, the said Matthew Cartwright, have hereunto
set my hand and seal, this Fourteenth day of April, One thousand
cight hundred and sixty-three.