IMPROVEMENTS IN THE MEANS, EMPLOYED FOR EXTRACTING. THE TANNING MATTER OR SUBSTANCE FROM OLD, SCRAP, OR WASTE LEATHER, SUCH MATERIALS BEING APPLICABLE FOR TANNING. DYEING. AND OTHER PURPOSES
Year: 1877

page_text: LETTERS PATENT to Benjamin Foster and William Foster, both of Leeds, in the,
County of York, for the Invention of "IMPROVEMENTS IN THE MEANS,
EMPLOYED FOR EXTRACTING. THE TANNING MATTER OR SUBSTANCE FROM
OLD, SCRAP, OR WASTE LEATHER, SUCH MATERIALS BEING APPLICABLE FOR
TANNING. DYEING. AND OTHER PURPOSES."
Sealed the 7th December 1877, and dated the 9th June 1877.
PROVISIONAL SPECIFICATION left by the said Benjamin Foster and William
Foster at the Office of the Commissioners of Patents on the 9th June 1877.
BENJAMIN FOSTER and William FOSTER, both of Leeds, in the County of York.
"IMPROVEMENTS IN THE MEANS EMPLOYED FOR EXTRACTING THE TANNING
MATTER OR SUBSTANCE FROM OLD, SCRAP, OR WASTE LEATHER, SUCH MATERIALS
BEING APPLICABLE FOR TANNING, DYEING, AND OTHER PURPOSES."
•
We steep the leather in water for some time, then bring the water with the
leather in it up to boiling point, and allow it to boil for about two hours. The
liquor is then run off. In order to reduce the amount of water in the liquor wo
evaporate a quantity by ordinary means; this leaves behind a strong liquor con-
taining tanning materials, which is applicable for tanning, dyeing, and other
purposes. The sediment. which falls to the bottom of the liquor vessel contains a
quantity of tanning substances, which may be afterwards extracted in a similar
manner to the above described. That portion of the liquor which is evaporated
also on being condensed contains a quantity of tanning substances, but not to a high
degree. This may also be used for tanning, dyeing, and other purposes. 4. D

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Benjamin Foster and William Foster in the Great Seal Patent Office
on the 8th December 1877.
BENJAMIN FOSTER and WILLIAM FOSTER, both of Leeds, in the County of York.
"IMPROVEMENTS IN THE MEANS EMPLOYED FOR EXTRACTING THE TANNING
MATTER OR SUBSTANCE FROM OLD, SCRAP, OR WASTE LEATHER, SUCH MATERIALS
BEING APPLICABLE FOR TANNING, DYEING, AND OTHER PURPOSES."
According to our Invention we steep the leather in water for some time, then
bring the water with the leather in it up to boiling point, and allow it to boil for
about two hours. The liquor is then run off. In order to reduce the amount of
water in the liquor we evaporate a quantity by ordinary means; this leaves behind
a strong liquor containing tanning materials, which is applicable for tanning, dyeing,
and other purposes. The sediment which falls to the bottom of the liquor vessel
contains a quantity of tanning substances, which may afterwards be extracted in a
similar manner to the above described. That portion of the liquor which is evaporated
also on being condensed contains a quantity of tanning substances, but not to a high
degree; this may also be used for tanning, dyeing, and other purposes.
The accompanying Drawing shews a suitable apparatus for extracting tanning
matter or substance from scrap or other leather according to our Invention.
In some cases we steep the leather for some time in water, and then allow it to
boil for about two hours. The liquor is then run off. In order to reduce the
amount of water in the liquor we evaporate a quantity by ordinary means; this
leaves behind the strong liquor containing tanning materials, which is applicable for
tanning, dyeing, and other purposes; a tank a shewn in Drawing containing the upper
and lower compartments; b and c, separated from each other by a partition d,
perforated as shown. The leather is placed in the upper compartment b, into which
is blown steam at any convenient pressure through the steam pipe e, and for any
convenient length of time, which varies in accordance with the nature or texture of
the material under treatment. The steam at e is then turned off, and injected into
the lower compartment through pipe f. The steam impregnates the material, and
being condensed carries with it the tanning inatter therefrom. The condensed
liquid may be allowed to pass from the tank a into the cistern g, from whence it
may be taken and varied in strength by increasing or decreasing the amount of
water therein contained. Of course the boiling effect is produced on the material
by the use of the apparatus shewn in Drawing.
We would hore remark that other arrangements of tank may be employed for
boiling the material without departing from our Invention.
Having now described the nature of our Invention, and in what manner the same
is to be performed or carried into practice, what we clain and desire to be secured
to us by Letters Patent is, the application of the means employed for extracting the
tanning matter or substance from old, scrap, or other leather, and spent tan, substan-
tially as and for purposes herein set forth.
In witness whereof, we, the said Benjamin Foster and William Foster, have
hereunto set our hands and seals, this Seventh day of December, in the
year of our Lord One thousand eight hundred and seventy-seven.
Witness to the signature of the
said,
C. BONFIELD,
Clerk for A. R. & J. W. Harding,
Engineers & Patent Agents,
2, East Parade,
Leeds
DEN FOSTER. (L.S.)
WM. FOSTER. (L.B.)