IMPROVEMENTS IN THE MANUFACTURE OF ASPHALT
Year: 1878

page_text: LETTERS PATENT to Edward Griffith Brewer, of Chancery Lane, London, for
the Invention of "IMPROVEMENTS IN THE MANUFACTURE OF ASPHALT."
A communication from abroad by Victor Leon Daguzan, of Paris, France.
aled the 1st April 1879, and dated the 3rd October 1878.
PROVISIONAL SPECIFICATION left by the said Edward Griffith Brewer at the
Office of the Commissioners of Patents on the 3rd October 1878.
EDWARD GRIFFITH BREWER, of Chancery Lane, London. "IMPROVEMENTS IN
THE MANUFACTURE OF ASPHALT." (A communication from abroad by Victor
Leon Daguzan, of Paris, France.)
This Invention refers to a new manufacture of asphalt as hereafter described.
First. Gas or wood coal tar is poured into a cauldron or boiler and heated until
the product is completely anhydrous.
Second. Clayey or other earths which are mixed in the composition, such as
marble, calcureous yellow or blue stone dust, or other analogous substances, are
sifted with care and torrefied until complete dryness takes place, and they are then
slowly mixed with the coal tar; all the inconveniences attendant on great ebullition
are thus greatly reduced. These two conditions being carefully attended to a very
intimate cohesion is obtained between the coal tar and the inert material.
Third. During the manufacture, about the twentieth part of oxyde of iron is put
into the boiler, silicate of potash, barytes, sulphate of lime, phosphate of lime, salts
of soda, alumina, potash, manganese, and the like, or according to the density or
purity of the coal tar one or several of these substances. This mixture increases
the density of the product, and when it is well manufactured, a phenomenon takes
place, viz., reduction in volume which increases the density.
The manufacture is carried on in a cauldron or boiler of ordinary construction,
with a mixer for stirring up the material.
The most important part is the drying, the previous boiling of the coal tar, and
especially the phenomenon or final result which takes place, by giving a density of
from 2-3 to 25 and a reduction of 2/3 on the volume, which is, the inventor
believes, quite new.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Edward Griffith, Brewer in the Great Seal Patent Office on the 3rd
April 1879.
EDWARD GRIFFITH BREWER, of Chancery Lane, London.
"IMPROVEMENTS IN
THE MANUFACTURE OF ASPHALT." (A communication from abroad by Victor Leon
Daguzan, of Paris, France.)
This Invention refers to a new manufacture of asphalt, as hereafter described.
First. Gas or wood coal tar is poured into a cauldron or boiler and heated until
the product is completely anhydrous.
Second. Clayey or other earthis which, are mixed in the composition, such as
marble, calcareous yellow or blue stone dust, or other analogous substances, are sifted
with care and torrefied until complete dryness takes place, and they are then slowly
mixed with the coal tar; all the inconveniences attendant on great ebullition are
thus greatly reduced. These two conditions being carefully attended to a very
intimate cohesion is obtained between the coal tar and the inert material.
Third. During the manufacture, about the twentieth part of oxyde of iron is put
into the boiler, silicate of potash, barytes, sulphate of lime, phosphate of lime, salts
of soda, alumina, potash, manganese, and the like, or according to the density or
purity of the coal tar one or several of these substances. This mixture increases
the density of the product, and when it is well manufactured a phenomenon takes
place, viz., reduction in the volume, which increases the density.
The manufacture is carried on in a cauldron or boiler of ordinary construction,
with a mixer for stirring up the material. The most important part is the drying, the
previous boiling of the coal tar, and especially the phenomenon or final result, which
takes place by giving a density of from 2.3 to 2.5 and a reduction of 2/3 on the
volume, which is, the inventor believes, quite new.
The materials may be employed together or separately, and the proportions varied
according to circumstances.
Having now described the nature of the said Invention and in what manner is
to be performed, I declare that I claim as the aforesaid improvements in the
manufacture of asphalt,-
First. The preparation of coal tar substantially as set forth.
Second. The sifting and torrefying of the materials before described, substantially
as and for the purposes set forth.
Third. In the mixture of the materials above described, substantially as and for
the purpose set forth.
In witness whereof, I, the said Edward Griffith Brewer, have hereunto set
my hand and seal, this Third day of April, in the year of our Lord One
thousand eight hundred and seventy-nine.
TC
RREWER
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