Improvements in the Manufacture of Extracts from Logwood and other Dyewoods, also in Preparing Dyewoods for use in Dyeing.
Year: 1891

page_text: Date of Application, 6th July, 1891
Complete Specification Left, 6th Apr., 1892-Accepted, 7th May, 1892
PROVISIONAL SPECIFICATION.
Improvements in the Manufacture of Extracts from Logwood and
other Dyewoods, also in Preparing Dyewoods for use in Dyeing.
I, WILLIAM BANCROFT ESPEUT, of Spring Gardens, Buff Bay, Jamaica,
West Indies, now residing at 19 Auriel Road, West Kensington, in the County of
Middlesex, Esquire, do hereby declare the nature of this invention to be as
follows:-
.
This invention has for its object improvements in the manufacture of extracts
from logwood and other dyewoods also in preparing dyewoods for use in dyeing.
At present in the manufacture of logwood extract it is usual to reduce the
wood to chips and then to add water to obtain the extractive matter therefrom.
According to my invention I reduce the wood by means of rough grind stones
with which the wood is kept in contact with a suitable pressure. A stream of
Water carries away the ground stuff as it is produced into a receiving cistern from
which the woody matter with a sufficient quantity of water is taken to other cisterns
in which it is stored and allowed to ferment.
From these latter vessels after a suitable time the woody matter is taken to
diffusing vessels where it is diffused with water and heat is applied.
The liquor is passed in succession through several diffusers and ultimately when
of sufficient strength is concentrated in vacuo and so the extract is obtained in a
form suitable for the market.
In order to avoid the addition of more water than is required for the purpose of
diffusion the water from the receiving tank may by the aid of a pump be passed
again and again over the stone.
By this process I obtain a greater yield of coloring matter; at the same time I
avoid all contact with steel or iron surfacts and also I cheapen the process.
For dyeing worsted and in some other cases, it is usual to employ the powdered
wood and not the extract. In such cases I prepare the wood by grinding upon a
stone and subsequent fermentation as already described but omitting diffusion.
employ the woody matter at once in the dyeing operation.
Dated this 6th day of July 1891.
I
CARPMAEL & Co.,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in the Manufacture of Extracts from Logwood and
other Dyewoods, also in Preparing Dyewoods for use in Dyeing.
I, WILLIAM BANCROFT ESPEUT, of Spring Gardens, Buff Bay, Jamaica,
West Indies, lately residing at 19 Auriel Road, West Kensington, in the County
of Middlesex, and now resident at 14 Addison Gardens London W. Esquire, do
hereby declare the nature of this invention and in what manner the same is to
be performed to be particularly described and ascertained in and by the following
statement :-
This invention has for its object improvements in the manufacture of extracts
from logwood and other dyewoods also in preparing dyewoods for use in dyeing.
At present in the manufacture of logwood extract it is usual to reduce the wood
to chips and then to add water to obtain the extractive matter therefrom.
According to my invention 1 reduce the wood by means of rough grind stones
with which the wood is kept in contact with a suitable pressure.
Price ed]
A stream of

page_text: water carries away the ground stuff as it is produced into a receiving cistern from
which the woody matter with a sufficient quantity of water is taken to other cisterns
in which it is stored and allowed to ferment if desired.
From these latter vessels after a suitable time the woody matter is taken to
diffusing vessels where it is diffused with water and heat is applied.
The liquor is passed in succession through several diffusers and ultimately when
of sufficient strength is concentrated in cucuo and so the extract is obtained in a
form suitable for the market.
.
In order to avoid the addition of more water than is required for the purpose of
diffusion the water from the receiving tank may by the aid of a pump be passed
again and again over the stone.
By this process I obtain a greater yield of colouring matter; at the same time I
avoid all contact with steel or iron surfaces and also I cheapen the process.
For dyeing worsted and in some other cases, it is usual to employ the powdered
wood and not the extract. In such cases I prepare the wood by grinding upon a
stone and subsequent fermentation as already described but omitting diffusion.
employ the woody matter at once in the dyeing operation.
I-
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
r
1.The process of manufacturing, extracts from logwood and other dyewoods
and also in preparing dyewoods for use in dyeing consisting in grinding and after-
wards fermenting the wood substantially as described.
2. The process of manufacturing extracts from logwood and other dyewoods
consisting in first grinding the wood then fermenting it afterwards heating it with
water and evaporating the extract substantially as described.
3. The manufacture of extracts from logwood and other dyewoods also in
preparing dyewoods for use in dyeing substantially as described.
Dated this Fourth day of April 1892.
1
W. BANCROFT ESPEUT,