A NEW AND IMPROVED METHOD FOR CHANGING ALL KINDS OF LEATHER INTO A FINE AND READILY DECOMPOSABLE POWDER FOR, FERTILIZING PURPOSES
Year: 1878

page_text: LETTERS PATENT to Frank Wirth, of the Firm of Wirth and Company, Patent,
Solicitors, at Frankfort-on-the-Main, in the Empire of Germany, for the
Invention of "A NEW AND IMPROVED METHOD FOR CHANGING ALL KINDS
OF LEATHER INTO A FINE AND READILY DECOMPOSABLE POWDER FOR,
FERTILIZING PURPOSES." A communication from Ludwig Rissmüller, Doctor;
of Philosophy, and Hans Wiesinger, Doctor of Philosophy, both of Göttingen,
in the Empire of Germany.
ealed the 4th March 1879, and dated the 9th September 1878.
PROVISIONAL SPECIFICATION left by the said Frank Wirth at the Office
of the Commissioners of Patents on the 9th September 1878.
FRANK WIRTH, of the Firm of Wirth and Company, Patent Solicitors, at
Frankfort-on-the-Main, in the Empire of Germany. "A NEW AND IMPROVED
METHOD FOR CHANGING ALL KINDS OF LEATHER INTO A FINE AND READILY
DECOMPOSABLE POWDER FOR FERTILIZING PURPOSES." [A communication from
Ludwig Rissmüller, Doctor of Philosophy, and Hans Wiesinger, Doctor of Philosophy,
both of Göttingen, in the Empire of Germany.]
This Invention relates to a new and improved chemical method for changing all
kinds of leather into a fine and readily decomposable powder for fertilizing..
purposes.
In carrying the said Invention into practice I treat all kinds of leather according
to a method described in the Specification of Letters Patent granted to L. Rissmüller.
and H. Wiesinger, and dated the 11th February, A.D. 1878, No. 560, the only
difference being in the passage of steam through the solution of lime water, which
requires a longer or shorter time; for example, white leather needs only half an
hour, while unused tanned leather requires three quarters of an hour, old leather,
such, for instance, as old boots, about three hours.
The following is the description of the method employed, that is to say:-A
solution of lime water is made by mixing in suitable barrels about four kilogrammes
(8 lbs.) of oxide of lime with from two to three hundred kilogrammes (four to six
hundred lbs.) of water. This solution is brought to a temperature of 100° centigrade
by means of steam, and about 50 kilogrammes (100 lbs.) of leather to be treated

page_text: are placed in each barrel. Its contents are kept boiling for the above stated times
by the continued admission of steam, after which it is removed and the hot liquid
immediately supplied with a new lot of leather, a sufficient quantity of lime being
first added.
This prepared wet portion of leather is afterwards dried and reduced to a powder
by any suitable machine, which is then in a fit condition for the above-named
uses.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Frank Wirth in the Great Seal Patent Office on the 7th March
1879.
-
FRANK WIRTH, of the Firm of Wirth and Company, Patent Solicitors, at
Frankfort-on-the-Main, in the. Empire of Germany. "A NEW AND IMPROVED
METHOD FOR CHANGING ALL KINDS OF LEATHER INTO A FINE AND READILY
DECOMPOSABLE POWDER FOR FERTILIZING PURPOSES." A communication from
Ludwig Rissmüller, Doctor of Philosophy, and Hans Wiesinger, Doctor of Philosophy,
both of Göttingen, in the Empire of Germany.
This Invention relates to a new and improved chemical method for changing
all kinds of leather into a fine and readily decomposable powder for fertilizing
purposes.
.
In practising the said Invention I treat any or all kinds of leather according to
a method or process described in the Specification of Letters Patent granted to me,
and bearing date the 11th day of February, A.D. 1878, No. 560, for an Invention
communicated to me, by L. Rissmüller and H. Wiesinger, and relating to a chemical
method of treating half woollen rags and obtaining therefrom a decomposable
powder, the difference between that and my present Invention being in the passage
of steam through the solution of lime water, which requires a longer or shorter
time; for example, white leather needs only half an hour, while unused tanned
leather requires three-quarters of an hour, and old leather, such, for instance, as
old boots, requires about three hours.
The following is the description of the method or process employed for the
purpose of this Invention, that is to say:-A solution of lime water is made by
mixing in suitable barrels or vessels about four kilogrammes (8 lbs.) of oxide of lime
with from two to three hundred kilogrammes (4 to 6 hundred lbs.) of water. This
solution is brought to a temperature of 100° centigrade by means of steam, and
about 50 kilogrammes (100 lbs.) of leather to be treated are placed in each barrel.
Its contents are kept boiling for the above stated times by the continued admission
of steam, after which they are removed and the hot liquid immediately supplied
with a fresh portion of leather, a sufficient quantity of lime being first added.
This prepared wet portion of leather is afterwards dried and reduced to a powder
by any suitable machine, and is then in a fit condition for the above-named
uses.
Having thus fully described the said Invention, and the manner of performing
the same, I wish it understood that I claim the herein-described method or process
for the production of a fine and readily decomposable powder from leather, for the
purposes specified.
:. .
..
In witness whereof, I, the said Frank Wirth, have hereunto set my hand and
seal, this Third day of March, in the year of our Lord One thousand eight
hundred and seventy-nine.