AN IMPROVED PROCESS FOR THE PRODUCTION OR MANUFACTURE OF FLUO-SILICATES OF TIN, ZINC, AND BARYTA, AND THEIR APPLICATION AS PIGMENTS FOR GLAZING, ENAMELLING, AND IN THE MANUFACTURE OF GLASS
Year: 1861

page_text: LET ERS PATENT to Thomas Cobley, of Meerholz, Electorate of
Hesse, Germany, Metallurgist, for the Invention of "AN IMPROVED
PROCESS FOR THE PRODUCTION OR MANUFACTURE OF FLUO-SILICATES OF TIN,
ZINC, AND BARYTA, AND THEIR APPLICATION AS PIGMENTS FOR GLAZING,
ENAMELLING, AND IN THE MANUFACTURE OF GLASS."
Sealed the 11th January 1862, and dated the 15th July 1861.
PROVISIONAL SPECIFICATION left by the said Thomas Cobley at the
Office of the Commissioners of Patents, with his Petition, on the 15th
July 1861.
I, THOMAS COBLEY, of Meerholz, Electorate of Hesse, Germany, Metal-
lurgist, do hereby declare the nature of the said Invention for "AN IMPROVED
PROCESS FOR THE PRODUCTION OR MANUFACTURE OF FLUO-SILICATES OF TIN, ZINC,
AND BARYTA, AND THEIR APPLICATION AS PIGMENTS FOR GLAZING, ENAMELLING, AND
IN THE MANUFACTURE OF GLASS," to be as follows:-
My Invention consists in forming fluo-silicic acid by the decomposition of
any fluorine compound, preferably fluor spar or cryolite, by sulphuric or other
available acids in a liquid or gaseous form, with sand or any finely-divided
siliceous combination in due proportions, that is to say, adding sufficient sul-
phuric acid to disengage the fluorine contained in the fluoric combination
employed which is to be determined by its per-centage, that is, their chemical
Price di

page_text: equivalents, and then mixing up so much of the siliceous compound or sand,
quartz, or other like substances as the fluorine disengaged is capable of
taking up, rather employing an excess than not, to avoid the escape of free
fluoric acid, and passing this fluo-silicic acid in a gascous form into solutions
of tin, zinc, and baryta derived either by dissolving the oxides or metals or
ores of the said metals, or by the double decomposition of any salts of the
same already formed or obtained as bye products, or by the direct decom-
position of the oxides or hydrates of the said tin, zinc, and baryta by the con-
densed or liquid fluo-silicic acid. The precipitate has to be collected, washed,
and dried.
These fluo-silicates I propose employing as pigments and in certain
adaptations of the same; for this purpose I use a solution of borax. The
zinc and baryta I employ singly or collectively in the manufacture of glass and
porcelain for glazing and enamelling; the tin, both in combination with lead and
other substances.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said Thomas Cobley in the Great Seal Patent Office on the 15th
January 1862.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, THOMAS
COBLEY, of Meerholz, Electorate of Hesse, Germany, Metallurgist, send
greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Fifteenth day of July, in the year of our Lord
One thousand eight hundred and sixty-one, in the twenty-fourth year of Her
reign, did, for Herself, Her heirs and successors, give and grant unto me, the
said Thomas Cobley, Her special licence that, the said Thomas Cobley, my
executors, administrators, and assigns, or such others as I, the said Thomas
Cobley, 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 "AN IMPROVED PROCESS
FOR THE PRODUCTION OR MANUFACTURE OF FLUO-SILICATES OF TIN, ZINC, AND
BARYTA, AND THEIR APPLICATION AS PIGMENTS FOR GLAZING, ENAMELLING, AND IN
THE MANUFACTURE OF GLASS," upon the condition (amongst others) that I,
the said Thomas Cobley, my executors or administrators, by an instrument in

page_text: writing under my, or their, or one of their hands and seals, should par-
ticularly 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 Thomas Cobley, 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 state-
ment, that is to say:-
I propose to form fluo-silicate of tin by dissolving the oxide of tin in fluo-
silicic acid, or by decomposing a solution of a salt of tin by means of fluo-silicic,
or if a silicate of tin, I act upon it by means of fluoric acid, and form the
fluo-silicate. I then treat the fluo-silicate thus formed with sulphide of
ammonium or sulphuretted hydrogen, so as to produce a sulphide.
sulphide I propose to apply as a pigment or glaze or enamel in the manufac-
ture of porcelain, either in combination with lead or separately, as the case
may be.
This
I propose to form the fluo-silicate of baryta in the manner described in my
Patent No. 1732, dated 8th July, 1861, but in addition to the manner there
described, I propose also to form it by acting upon silicate of baryta, either
native or artificial, with fluoric acid. I propose to apply this fluo silicate of
baryta either with or without the fluo-silicates of zinc as a substitute for lead
in the manufacture of glass, or as a pigment or enamel in the manufacture of
porcelain; I also propose to apply it in the same manner in combination with
fluo-silicate of tin.
I propose to form fluo-silicate of zinc by dissolving the oxide of zinc in
fluo-silicic acid, or by precipitating a solution of a salt of zinc by the addition
of the chemical equivalent of the said acid. I then collect the precipitate
and dry the same in any convenient way. When I can obtain a silicate of
zinc, either natural or artificial, I treat it, if free from iron, with an equiva-
lent of fluoric acid, and form a fluo-silicate in this way instead of using the
fluo-silicic acid.
I propose to use the fluo-silicate of zinc as a glaze or pigment or enamel,
either with or without baryta; one of the chief applications, however, which
I propose to make use of it as a substitute for lead in glass manufacture, and I
use it either alone or in combination with baryta, by means of which I am
enabled to produce a glass possessing peculiar optical properties that is far
more free from veins and triæ.
i
Having now described the nature of my Invention, and how the same is

page_text: carried into effect, I wish it understood that what I claim as new, and wish
secured by the before in part-recited Letters Patent, is,―
First, the process and methods of manufacturing fluo-silicates of tin, baryta,
and zinc, substantially as set forth in this Specification.
And, second, I claim the application of fluo-silicate of tin as a pigment or
glaze, or enamel in the manufacture of porcelain; of baryta in combination
with fluo-silicate of zinc as a substitute for lead in the manufacture of glass;
and in combination with fluo-silicate of tin as a glaze or enamel in the manu-
facture of porcelain, and of the fluo-silicate of zinc, either alone or in combina-
tion with fluo-silicate of baryta in the manufacture of glass, substantially as
described and set forth in the body of this Specification.
In witness whereof, I, the said Thomas Cobley, have hereunto set my
hand and seal, this Fifteenth day of January, One thousand eight
hundred and sixty-two.
TH. COBLEY. (L.S.)