IMPROVEMENTS IN OBTAINING AND TREATING EXTRACTS PROM CERTAIN DYE
Year: 1854

page_text: LETTERS PATENT to Thomas Roberts and John Dale, of Manchester, in
the County of Lancaster, Manufacturing Chemists, for the Invention of
"IMPROVEMENTS IN OBTAINING AND TREATING EXTRACTS PROM CERTAIN DYE
PROVISIONAL SPECIFICATION left by the said Thomas Roberts and John
Dale at the Office of the Commissioners of Patents, with their Petition,
on the 7th October 1854.
We, THOMAS ROBERTS and JOHN DALE, of Manchester, in the County of
Lancaster, Manufacturing Chemists, do hereby declare the nature of the said
Invention for "IMPROVEMENTS IN OBTAINING AND TREATING EXTRACTS FROM
CERTAIN DYE WOODS, AND IN APPARATUS FOR OBTAINING SUCH EXTRACTS" to be as
follows:-
Our improvements relate to extracts obtained from logwood and other
materials requiring similar treatment, and consist, firstly, in an arrangement of
apparatus for performing the extracting process. The material to be operated
upon is placed in a vessel capable of being closed, and the fluid is then
admitted; this is subsequently driven out by the action of steam into a tub
placed below, from whence it is pumped into a second vessel, similar to the first,

page_text: and charged in like manner with the dye wood again to pass through it, and to
be forced out into a receptacle below. This operation we repeat through as
many vessels as may be desired, so as to obtain an extract of sufficient degree
of concentration without evaporation.
Secondly, our Invention consists in a method of treating such dye extracts
as aforesaid, whether obtained by our improved method or by other means.
This we effect by submitting the fluid to the action of air which is forced or
drawn through it.
Thirdly, our Invention consists in the application of "galvanized iron," or
iron otherwise coated with zinc or zinc plate, to the purpose of making the
vessels used for obtaining such extracts as aforesaid.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said Thomas Roberts and John Dale in the Great Seal Patent
Office on the 7th April 1855.
TO ALL TO WHOM THESE PRESENTS SHALL COME, we, THOMAS
ROBERTS and JOHN DALE, of Manchester, in the County of Lancaster,
Manufacturing Chemists, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Seventh day of October, in the year of our Lord
One thousand eight hundred and fifty-four, in the eighteenth year of Her
reign, did, for Herself, Her heirs and successors, give and grant unto us,
the said Thomas Roberts and John Dale, Her especial license that we, the
said Thomas Roberts and John Dale, our executors, administrators, and
assigns, or such others as we, the said Thomas Roberts and John Dale,
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 OBTAINING AND TREATING
EXTRACTS FROM CERTAIN DYE WOODS, AND IN APPARATUS FOR OBTAINING SUCH
EXTRACTS," upon the condition, amongst others, that we, the said Thomas
Roberts and John Dale, or one of us, by an instrument in writing under
our hands and seals, or under the hand and seal of one of us, 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

page_text: 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 John Dale, do hereby declare the
nature of our said Invention, and in what manner the same is to be per-
formed, to be particularly described in and by the following statement (that
is to say):
Our improvements relate to extracts obtained from logwood, peach, Brazil,
sapan, or other woods requiring similar treatment, and consist, firstly, in an
arrangement for performing the extracting process. In order to effect this, we
use vessels such as are ordinarily employed as single or detached apparatus,
but according to our Invention we place a series of them conveniently near to
each other, and provide means for closing them steam-tight at top; the process
is then conducted after the following manner:-The several vessels being
charged with the material from which the extract is to be obtained, water is
supplied to the first of the series at the upper part thereof, after which steam
is admitted to the surface, and the fluid is thereby driven downward and
discharged into a vessel below, a tap having been opened for that purpose.
The extract thus obtained is then pumped up into the second vessel of the
series, and in like manner forced through the material into the tank below,
from whence it is again pumped up into the third, and so on, through as many
as may be used, until an extract of required concentration is obtained; this
having been accomplished, we pass water as above described through the
whole series, and reserve it for the commencement of operations upon fresh
material, as above described; by this method we are enabled to obtain a
required concentration of extract without evaporation.
Secondly, our Invention relates to a method of treating such extracts as
aforesaid, whether obtained by our improved process or by other means, and
consists in submitting the fluid to the action of air drawn or forced through it.
In order to effect this, we employ a vessel of suitable material, constructed
with a central pipe, the lower end of which is provided with branches, having
numerous perforations; through this central pipe we propel air by means of a
pump or other apparatus, which thereby becomes distributed in the fluid and
forced through it. This process we conduct, say, for two or three days, but as
the necessary time for obtaining the best effect will vary, the duration must be
regulated by the experience of the operator.
Thirdly, our Invention relates to the construction of vessels used for obtaining
such extracts, as aforesaid, and consists in the application for that purpose of
"galvanized iron," or iron otherwise coated with zinc, or the vessels may be
made of zinc plate.

page_text: Having thus described and ascertained the nature of our said Invention, and
the manner in which the same is to be performed, I desire it to be understood that
we claim, as secured to us under the above in part recited Letters Patent,-
Firstly, the method of using a series of vessels for the purposes above
set forth.
Secondly, the use of currents of air forced or drawn through the dye
extracts.
Thirdly, the use of the materials above mentioned as applied to vessels in
which the dye extracts are obtained.
In witness whereof, I, the said John Dale, have hereunto set my hand
and seal, this Fifth day of April, in the year of our Lord One thousand
eight hundred and fifty-five.
JOHN DALE. (L.S.)