IMPROVEMENTS IN THE PRODUCTION OF PIGMENTS
Year: 1877

page_text: LETTERS PATENT to Peter Cannell Bunn, of Stoke Ferry, in the County of
Norfolk, for the Invention of "IMPROVEMENTS IN THE PRODUCTION OF
PIGMENTS"
Sealed the 17th April 1877, and dated the 13th February 1877.
PROVISIONAL SPECIFICATION left by the said Peter Cannell Bunn at the
Office of the Commissioners of Patents on the 13th February 1877.
PETER CANNELL BUNN, of Stoke Ferry, in the County of Norfolk. "IMPROVE
MENTS IN THE PRODUCTION OF PIGMENTS."
•
My Invention relates to the production of pigments, more especially a black pig-
ment, by a more economical process than heretofore, and consists in the employment
for that purpose of what are known as the phosphatic or other iron compounds
which occur in Norfolk and elsewhere, and of peat charcoal in the manner herein-
after described.
In carrying out my Invention I reduce the before-mentioned iron ores or com-
pounds to a fine state of division, and if necessary lixiviate the same, and then
subject such finely divided iron ores or compounds to calcination or to the action of
heat, the same being contained in a closed furnace or other heating apparatus in
order that the lower oxides may be converted into the higher oxides. I also take
peat, and having first either completely or partially dried the same, if necessary, I
introduce it into a closed receptacle heated on its exterior by a furnace or other
suitable means, and I there subject it to the action of the heat for a sufficient
period until the tar and gaseous matters are given off, which matters may be dis-
charged through a suitable pipe or outlet; I then take the peat charcoal thus pre-
pared and reduce it to a fine state of division and mix the powder so obtained with
the oxides of iron prepared in the manner before mentioned, and with linseed or
other suitable oil whereby a black pigment will be produced, which may be
applied in the ordinary manner.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Peter Cannell Bunn in the Great Seal Patent Office on the 13th
August 1877.
PETER CANNELL BUNN, of Stoke Ferry, in the County of Norfolk. "IMPROVE-
MENTS IN THE PRODUCTION OF PIGMENTS."
My said Invention relates to the production of pigments, more especially a black
pigment, by a more economical process than heretofore, and consists in the employ-
ment for that of what are known as the phosphatic or other iron compounds which
occur in Norfolk and elsewhere, and of peat charcoal in the manner herein-after
described.
.
In carrying out my said Invention I reduce the before mentioned iron ores or
compounds to a fine state of division, and if necessary lixiviate the same, and then
subject such finely divided iron ores or compounds to calcination or to the action of
heat, the same being contained in a closed furnace or other heating apparatus, in
order that the lower oxides may be converted into the higher oxides, or I first
calcine such iron ores or compounds and then reduce the same to a fine state of
division; I also take peat, and having first either completely or partially dried the
same, if necessary, I introduce it into a closed receptacle heated on its exterior by a
furnace or other suitable means, and I there subject it to the action of the beat for
a sufficient period until the tar and gaseous matters are given off, which matters may
be discharged through a suitable pipe or outlet; I then take the peat charcoal thus
prepared and reduce it to a fine state of division, and mix the powder so obtained
with the oxides of iron prepared in the manner before mentioned, and with linseed
or other suitable oil, whereby a black pigment will be produced, which may be
applied in the ordinary manner.
Having now described and particularly ascertained the nature of my said Inven-
tion, and the manner in which the same is or may be used or carried into effect, I
would observe in conclusion that what I consider to be novel and original and
therefore claim as the Invention secured to me by the herein-before in part recited
Letters Patent is, the production of a pigment by the employment of peat charcoal
in conjunction with the product obtained from the calcination of phosphatic or
other iron ores in the manner herein-before described.
In witness whereof, I, the said Peter Cannell Bunn, have to this my
Specification set my hand and seal, this Tenth day of August, One
thousand eight hundred and seventy-seven.