AN IMPROVED METHOD FOR PRODUCING of York for an Invention of METALLIC Wolfram or aLLOYS OR CARBURATES OF WOLFRAM
Year: 1882

page_text: LETTERS PATENT to Carl Johan Laurentz Leffler of Sheffield in the County
"AN IMPROVED METHOD FOR PRODUCING
of York for an Invention of
METALLIC Wolfram or aLLOYS OR CARBURATES OF WOLFRAM."
PROVISIONAL SPECIFICATION left by the said Carl Johan Laurentz
Leffler at the Office of the Commissioners of Patents on the 25th July 1882.
CARL JOHAN LAURENTZ LEFFLER, of Sheffield in the County of York-" AN
IMPROVED METHOD FOR PRODUCING METALLIC WOLFRAM, OR ALLOYS OR CARBURATES
OF WOLFRAM."
My Invention which relates to the production of Metallic Wolfram, or of its
alloys, or carburates, consists (in one method) of carrying it into practice in
charging a Furnace with alternate layers of Wolfram ore, or oxides or salts of
Wolfram and charcoal or other carbonaceous matter with or without the addition
of fluxes or other ores or oxides of metals-the furnace being so constructed as to.
prevent any ingress of air, or oxidizing gases into the chamber or part of the furnace
containing the mixture, during the process of heating the same till it becomes
reduced to metallic Wolfram, or alloys or carburates of Wolfram.
As a modification of the above mentioned method the Wolfram ore, or oxides, or
salts of Wolfram, with or without the addition of fluxes or other ores, or oxides of
metal, may if preferred be mixed with charcoal or other carbonaceous matter
previous to being placed in the furnace, and the charging with alternate layers of
charcoal or other carbonaceous matter may be dispensed with or be used as may be
considered advisable. I do not confine myself to any particular construction of
Furnace or to the means of charging with the mixture, or withdrawing the charges
except in so much that the chamber or that part containing the mixture must be
arranged so that it may be heated to the required degree, without permitting any
ingress of air or oxidizing gases into the said chamber.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Carl Johan Laurentz Leffler in the Great Seal Patent Office
on the 25th January 1883.
CARL JOHAN LAURENTZ LEFFLER of Sheffield in the County of York,
"AN
IMPROVED METHOD FOR PRODUCING METALLIC WOLFRAM, OR ALLOYS, OR CARBURATES
OF WOLFRAM"
My Invention which relates to the production of metallic Wolfram or its alloys,
or carburets (or carbides) consists (in one method of carrying it into practice) in
charging & Furnace with alternate layers of Wolfram ore, or oxides, or salts of
Wolfram, and charcoal or other carbonaceous matter, with or without the addition
of fluxes, or of other ores, or oxides of metals, as may be thought desirable. The
furnace must be so constructed as to prevent any ingress of air, or oxidizing gases
into the chamber of the furnace, or that part containing the charge of the
above mentioned materials, during the process of heating the same until it
becomes reduced to metallic Wolfram, or alloys, or carburets of Wolfram, either
in combination with other metals or not.
As a modification of the above described method, the Wolfram ore, or oxides, or
salts of Wolfram, with (or without) the addition of fluxes or other ores, or oxides of
metals, may be mixed with charcoal or other carbonaceous matter, previous to being
placed in the furnace, and the charging with alternate layers of charcoal or other
carbonaceous matter may be dispensed with, or if considered desirable, may be used
in addition.
I wish it to be understood that I do not confine myself to any particular
construction of Furnace, or to the means of charging, or withdrawing the charges
of the said materials, except in this particular; that the chamber, or that part of
the furnace, containing the materials to be operated upon must be constructed, so
that it may be heated to the required degree without permitting any ingress of air
or oxidizing gases into the said chamber.
Having now described the nature of my invention, and the manner in which it
may be carried into practice, wish it to be understood that what I claim as novel
and original, and as the invention secured to me by the herein before in part-recited
Letters Patent, is :—
The improved method (with the modification above described) of producing
Metallic Wolfram, or alloys, or carburets of Wolfram, in combination or not, with
other metals by placing the materials above mentioned in a furnace so con- 3
structed that no air, or oxidizing gases can obtain ingress to the said materials,
or "charge," substantially as herein before described, and for the purpose specified.
In witness whereof I the said Carl Johan Laurentz Lefter have hereunto set
my hand and seal, this twenty-third day of January, in the year of our
Lord, 1883.
CJ L LEFFLER (L.S.)