COLORING AND WRDENING MAeG Go Ton Docப் PURPOSES
Year: 1859

page_text: LETTERS PATENT to Frederic Louis Lawrence, of 50, Berners Street,
Oxford Street, in the County of Middlesex, Dentist, for the Invention
LETTERS PATENT to Frederic Louis Lawrence, of 50, Berners Street,
Oxford Street, in the County of Middlesex, Dentist, for the Invention
COLORING AND WRDENING MAeG Go Ton Docப்
PURPOSES"
Sealed the 22nd November 1859, and dated the 9th August 1859.
PROVISIONAL SPECIFICATION left by the said Frederic Louis Lawrence
at the Office of the Commissioners of Patents, with his Petition, on the
9th August 1859.
I, FREDERIC LOUIS LAWRENCE, of 50, Berners Street, Oxford Street, in the
County of Middlesex, Dentist, do hereby declare the nature of the Invention
for "IMPROVEMENTS IN COLORING AND HARDENING ELASTIC GUMS FOR DENTAL
PURPOSES," to be as follows:-
This Invention consists in coloring to the required tint the elastic gums
used by dentists, and hardening them for the purpose of being used in lieu of
gold or bone at present in use. I take caoutchouc, sulphur, oxide of zinc,
and cinibar (vermillion) in certain proportions, and pass them together through
grinding rollers or masticating apparatus until thoroughly incorporated or
blended. The proportions which are believed to be most suitable are at the
rate of about 3 lbs. of caoutchouc, 1 lbs. of sulphur, 1 lb. of vermillion,
9 lbs. of oxide of zinc, but these proportions may be varied. The compound
is to be moulded as heretofore when using compounds of caoutchouc for dental
purposes, and subjected to heat, as is well understood, to obtain the desired
hardness, after which it is polished by any known means, and then placed in

page_text: a closed glass vessel containing alcohol or other suitable liquid, and subjected
to solar light, which brings the required flesh color to the surface. By this
means the material will be found better suited to answer the purpose of bone
11
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said Frederick Louis Lawrence in the Great Seal Patent Office
on the 8th February 1860.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, FREDERICK
LOUIS LAWRENCE, of 50, Berners Street, Oxford Street, in the County of
Middlesex, Dentist, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Ninth day of August, in the year of our Lord One
thousand eight hundred and fifty-nine, in the twenty-third year of Her reign,
did, for Herself, Her heirs and successors, give and grant unto me, the
said Frederick Louis Lawrence, Her special licence that I, the said
Frederick Louis Lawrence, my executors, administrators, and assigns, or such
others as I, the said Frederick Louis Lawrence, my executors, adminis-
trators, 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 COLORING AND HARDENING ELASTIC GUMS
FOR DENTAL PURPOSES," upon the condition (amongst others) that I, the
said Frederick Louis Lawrence, my executors or administrators, 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 Inven-
tion, 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 Frederick Louis Lawrence, do
hereby declare the nature of the 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 :-
This Invention consists in coloring to the required tint the elastic gums
used by dentists, and. hardening them for the purpose of being used in lieu of
gold or bone at present in use. I take caoutchouc, sulphur, oxide of zinc,
and cinnibar (vermillion), in certain proportions, and pass them together

page_text: through grinding rollers or masticating apparatus until thoroughly incorporated
or blended. The proportions which are believed to be most suitable are at the
rate of about 3 lbs. of caoutchouc, 1 lbs. of sulphur, 1 lb. of vermillion,
9lbs. of oxide of zinc, but these proportions may be varied. The compound
is to be moulded as heretofore when using compounds of caoutchouc for dental
purposes, and subjected to heat, as is well understood, to obtain the desired
hardness; after which it is polished by any known means, and then placed in
a closed glass vessel containing alcohol or other suitable liquid, and subjected
to solar light, which brings the required flesh color to the surface. By this
means the material will be found better suited to answer the purpose of bone
or gold.
Having thus stated the nature of my Invention, I will proceed more fully
to describe the manner of performing the same.
Sulphur compounds of india-rubber (caoutchouc) have before been used by
dentists in preparing artificial gums and palates, but the color thereof has not
been satisfactory.
The object of my Invention, as above stated, is to obtain a better or more
natural color than has heretofore been obtained when using sulphur com-
pounds of india-rubber hardened by heat for dental purposes. The proportions
of the substances above mentioned may be varied, but I believe those above
given are the most convenient. When the compound has been prepared, the
same is used in the plastic state, and is moulded into the proper form in like
manner to that heretofore resorted to when using sulphur compounds of india-
rubber in the production of artificial gums or palates, and the moulded gums
or palates with the teeth, whilst retained in the moulds are subjected to heat
to produce the change as heretofore, and as is well understood. The hardened
artificial gums or palates when cold and polished are immersed in alcohol, and
placed in a position where the sun's rays will act thereon, by which the color of
the india-rubber compound will be changed, and the desired effect produced.
In witness whereof, I, the said Frederick Louis Lawrence, have here-
unto set my hand and seal, this Fourteenth day of October, in the
year of our Lord One thousand eight hundred and fifty-nine.
FREDERICK L. LAWRENCE. (L.s.)