IMPROVEMENTS IN THE PRODUCTION OF CAST IRON, IRON, AND STEEL
Year: 1869

page_text: LETTERS PATENT to John Henry Johnson, of 47, Lincoln's Init
Fields, in the County of Middlesex, Gentleman, for the Invention
of "IMPROVEMENTS IN THE PRODUCTION OF CAST IRON, IRON, AND STEEL."—
A communication from abroad by Jean Marie Joseph Charles Du
Lin and Jean Auguste Combe d'Alma, of Paris, in the Empire of
Branca
Sealed the 21st June 1870, and dated the 30th December 1869.
PROVISIONAL SPECIFICATION left by the said John Henry Johnson
at the Office of the Commissioners of Patents, with his Petition, on
the 30th December 1869.
I, JOHN HENRY JOHNSON, of 47, Lincoln's Inn Fields, in the County
of Middlesex, Gentleman, do hereby declare the nature of the said
Invention for "IMPROVEMENTS IN THE PRODUCTION OF CAST IRON, IRON, AND
STEEL," a communication from abroad by Jean Marie Joseph Charles
Du Lin and Jean Auguste Combe d'Alma, of Paris, in the Empire of
France, to be as follows:-
It has hitherto been customary to employ for the production of cast
iron, iron, or steel coke which has been produced from coal in the
ordinary coke ovens or otherwise, and which coke it has been found
always contains a considerable amount of the sulphur originally existing

page_text: in the coal employed. Now this Invention consists in the employment
of resin or of resinous products in conjunction with bituminous or other
coal, which after having been intimately mixed is subjected to a coking
process. The coke resulting will be found to contain a smaller proportion
of sulphur than coke produced from similar coal by the ordinary process
of coking, and owing in addition to its improved physical and chemical
properties will in practice be found better adapted for the production of
the metals and products before mentioned than the coke obtained by the
ordinary method.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said John Henry Johnson in the Great Seal Patent
Office on the 27th June 1870.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JOHN
HENRY JOHNSON, of 47, Lincoln's Inn Fields, in the County of Middle-
sex, Gentleman, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Thirtieth day of December, in the year
of our Lord One thousand eight hundred and sixty-nine, in the thirty-
third year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto me, the said John Henry Johnson, Her special
license that I, the said John Henry Johnson, my executors, adminis-
trators, and assigns, or such others as I, the said John Henry Johnson,
my executors, administrators, or assigns, should at any time agree with,
and no others, from time to time and at all times thercafter 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 THE PRODUCTION OF CAST IRON, IRON, AND STEEL," a
communication to me from abroad by Jean Marie Joseph Charles Du Lin
and Jean Auguste Combe d'Alma, of Paris, in the Empire of France,
upon the condition (amongst others) that I, the said John Henry
Johnson, my executors or administrators, by an instrument in writing
under my hand and scal, should particularly 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 Great Seal Patent
Office within six calendar months next and immediately after the date
of the said Letters Patent.

page_text: NOW KNOW YE, that I, the said John Henry Johnson, do hereby
declare the nature of the said Invention, and in what manner the
same is to be performed, to be particularly described and ascertained
in and by the following statement (that is to say) :-
It has hitherto been customary to employ for the production of cast
iron, iron, or steel coke which has been produced from coal in the
ordinary coke ovens or otherwise, and which coke it has been found
always contains a considerable amount of the sulphur originally existing
in the coal employed. Now this Invention consists in the employment
of resin or of resinous products in conjunction with bituminous or other
coal, which after having been intimately mixed is subjected to a coking
process. The proportion in which the resin may be employed will vary
according to the quality of the coal to be operated upon, and according
to the density of the coke it is desired to obtain. It has been found
that resin in the proportion of from five to ten per cent. will give good
results, but these proportions as has been before mentioned will vary.
The coke resulting will be found to contain a smaller proportion of
sulphur than coke produced from similar coal by the ordinary process of
coking, and owing in addition to its improved physical and chemical
properties will in practice be found better adapted for the production of
the metals and products before mentioned than the coke obtained by the
ordinary method.
Having now described and particularly ascertained the nature of the
said Invention, 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
employment of coke prepared in the manner herein-before described
for the production of cast iron, iron, and steel.
In witness whereof, I, the said John Henry Johnson, have to this
my Specification set my hand and seal, this Twenty-seventh day
of June One thousand eight hundred and seventy.