IMPROVEMENTS IN THE TREATMENT OF SPENT OXIDES OF IRON FOR THE PURPOSE OF EXTRACTING CYANIDES." PROVISIONAL SPECIFICATION
Year: 1872

page_text: LETTERS PATENT to James William Pollard, of 9, Mincing Lane,
Merchant, John Schofield, of 37, Mark Lane, Merchant, and Alex-
ander Butel, 25, Merchant Street, Bow, Manufacturing Chemist, all
in the County of Middlesex, for the Invention of "IMPROVEMENTS IN
THE TREATMENT OF SPENT OXIDES OF IRON FOR THE PURPOSE OF EXTRACTING
CYANIDES."
PROVISIONAL SPECIFICATION left by the said James William Pollard,
John Schofield, and Alexander Butel at the Office of the Com-
missioners of Patents, with their Petition, on the 4th September
1872.
We, JAMES WILLIAM POLLARD, of 9, Mincing Lane, Merchant, JOHN
SCHOFIELD, of 37, Mark Lane, Merchant, and ALEXANDER BUTEL,
25, Merchant Street, Bow, Manufacturing Chemist, all in the County of
Middlesex, do hereby declare the nature of the said Invention for

page_text: "IMPROVEMENTS IN THE TREATMENT OF SPENT OXIDES OF IRON FOR THE PURPOSE
OF EXTRACTING CYANIDES," to be as follows:-
This Invention has for its object the treatment by alkalies or the
alkaline earths of the spent oxides of iron as obtained after they have
been employed for the purification of gas, by which means the cyanides
which they contain are dissolved. The said oxides of iron may be
employed directly as obtained from the gas works, or they may be pre-
viously operated upon for the recovery of the sulphur, or sulphate, or
chloride of ammonium by any well known process.
In carrying out our Invention we take the said spent oxides and
agitate them by preference with milk of lime, and by such means we
obtain a solution which may be employed directly for the manufacture
of Prussian blue, or in the preparation of other cyanides, such as ferro-
cyanide of potassium, or cyanide of potassium, by any convenient and
well known process.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said James William Pollard, John Schofield, and
Alexander Butel in the Great Seal Patent Office on the 3rd March
1873.
TO ALL TO WHOM THESE PRESENTS SHALL COME, we, JAMES
WILLIAM POLLARD, of 9, Mincing Lane, Merchant, JOHN SCHOFIELD, of
37, Mark Lane, Merchant, and ALEXANDER BUTEL, 25, Merchant Street,
Bow, Manufacturing Chemist, all in the County of Middlesex, send
greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her a
Letters Patent, bearing date the Fourth day of September; in the
year of our Lord One thousand eight hundred and seventy-two, in
the thirty-sixth year of Her reign, did, for Herself, Her heirs and
successors, give and grant unto us, the said James William Pol-
lard, John Schofield, and Alexander Butel, Her special licence that a
we, the said James William Pollard, John Schofield, and Alexander
Butel, our executors, administrators, and assigns, or such others
as we, the said James William Pollard, John Schofield, and Alex-

page_text: ander Butel, our 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 THE TREATMENT OF SPENT OXIDES OF
IRON FOR THE PURPOSE OF EXTRACTING CYANIDES," upon the condition (amongst
others) that we, the said James William Pollard, John Schofield, and
Alexander Butel, our executors or administrators, by an instrument in
writing under our, or one of our, 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 Alexander Butel, on behalf of
myself and the said James William Pollard, and John Schofield, do
hereby declare the nature of our said Invention, and in what manner
the same is to be performed, to be particularly described and ascer-
tained in and by the following statement :-
This Invention has for its object the treatment by alkalies or the
alkaline earths of the spent oxides of iron as obtained after they have
been employed for the purification of gas, by which means the cyanides
which they contain are dissolved. The said oxides of iron may be
employed directly as obtained from the gas works, or they may be pre-
viously operated upon for the recovery of the sulphur, or sulphate, or
chloride of ammonium by any well known process.
In carrying out our Invention we take the said spent oxides and
agitate them by preference with milk of lime, and by such means we
obtain a solution which may be employed directly for the manufacture
of Prussian blue, or in the preparation of other cyanides, such as ferro-
cyanide of potassium, or cyanide of potassium, by any convenient and
well known process.
Having now described the nature of our said Invention, and the
manner in which the same is to be performed, what we claim and desire
to be secured to us by Letters Patent is, the improvements in the treat-

page_text: ment of spent oxides for the purpose of extracting cyanides, substantially
as herein-before described, or any mere modification thereof.
In witness whereof, I, the said Alexander Butel, on behalf of myself
and the said James William Pollard and John Schofield, have
hereunto set my hand and seal, this Third day of March, in the
year of our Lord One thousand eight hundred and seventy-
three