IMPROVEMENTS IN THE MANUFACTURE OF AN HYDRATED SILICA
Year: 1863

page_text: LETTERS PATENT to Fédor de Wyldé, of Trinity Square, Tower Hill, in
the County of Middlesex, Gentleman, for the Invention of "IMPROVEMENTS
PROVISIONAL SPECIFICATION left by the said Fédor de Wyldé at the
Office of the Commissioners of Patents, with his Petition, on the 17th
September 1863.
1, FEDOR DE WYLDE, of Trinity Square, Tower Hill, in the County of
Middlesex, Gentleman, do hereby declare the nature of the said Invention
for "IMPROVEMENTS IN THE MANUFACTURE OF AN HYDRATED SILICA," to be as
follows:-
My Invention consists in dissolving natural bydrated silica in a solution of
carbonated alkali under pressure and subject to the heat of steam, which
solution of silica in carbonated alkali is precipitated on exposure to the
atmospheric air resolving itself into its original constitutents carbonated alkali
and finely divided silica. All iron and other insoluble matters forming a
residuum in the digester. The organic matters are dissolved and retained in
solution in the alkali; whilst any remaining in the precipitated silica may be
removed by washing, leaving the silica in a state of perfect purity.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said Fédor de Wyldé in the Great Seal Patent Office on the
17th March 1864.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, FEDOR
DE WYLDE, of Trinity Square, Tower Hill, in the County of Middlesex,
Gentleman, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Seventeenth day of September, in the year of our
Lord One thousand eight hundred and sixty-three, in the twenty-seventh year
of Her reign, did, for Herself, Her heirs and successors, give and grant unto
me, the said Fédor de Wylde, Her special licence that I, the said Fédor de
Wylde, my executors, administrators, and assigns, or such others as I, the
said Fédor de Wylde, 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 "IM-
PROVEMENTS IN THE MANUFACTURE OF AN HYDRATED SILICA," upon the condition
(amongst others) that I, the said Fédor de Wylde, my executors or adminis
trators, 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 Fédor de Wylde, 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:
My Invention consists in dissolving natural hydrated silica in a solution of
carbonated alkali under pressure and subject to the heat of steam, which
solution of silica in carbonated alkali is precipitated on exposure to the
atmospheric air, revolving itself into its original constitutents carbonated
alkali and silica, the latter being in a finely divided state, all iron and other
insoluble matters forming a residuum in the digester. The organic matters are
dissolved and retained in solution in the alkali, whilst any remaining in the

page_text: precipitated silica may be removed by washing, leaving the silica in a state of
perfect purity purity.
In witness whereof, I, the said Fédor de Wylde, have hereunto set my
hand and seal, this Seventeenth day of March, in the year of our
Lord One thousand eight hundred and sixty-four.
FÉDOR DE WYLDE. (L.S.)