Process for Manufacturing Durable Incandescent Illuminating Bodies.
Year: 1898

page_text: Date of Application, 17th June, 1898-Accepted, 27th Aug., 1898
COMPLETE SPECIFICATION.
Process for Manufacturing Durable Incandescent Illuminating
Bodies.
I, ALBERT KOCH, Diplomated Chemist, of Bernau, in the Kingdom of Prussia,
in the Empire of Germany, do hereby declare the nature of this invention and in
what manner the same is to be performed, to be particularly described and ascer-
tained in and by the following statement:-
This invention relates to an improved process for manufacturing durable incan-
descent illuminating bodies, and its object specially consists in combining with the
method described in my Letters Patent No. 30145 dated 20th December 1897, a
preparatory process consisting in the impregnation of the fabric or other material
employed with an aqueous solution of thorium nitrate, the material being then
dried, incinerated and calined.
This preparatory process may however also be made use of in connection with
the manufacturing of incandescent bodies in general, in order to improve the
durability of the same.
Such being the nature and object of my said invention, the following is a com-
plete description of it.
A suitable fabric of tubular form but tapering towards the apex, is impregnated
with 30% aqueous solution of thorium nitrate, then freed by pressure from the
adhering liquid and dried; the dry fabric being subsequently incinerated and
then calcined and fixed in shape by the aid of gas under pressure.
The resulting structure or body which consists apart from the natural ash-
constituents of pure thorium oxide, is then suspended from a hook and dipped
in a vessel containing organic-compounds of silicon, mixed with an alcoholic
solution of cerium, as described in my Letters Patent No. 30145 A.D. 1897.
A thorough moistening of the thorium structure is thus effected and the latter
is then, whilst still moist, ignited and calcined again for 1-3 minutes, an operation
which results in the combustion of the organic compounds of silicon into silica,
which imparts to the structure a degree of solidity and elasticity hitherto
unattainable.
In addition to this, the silica-by reason of its fine state of division on the
thorium-body, and in conjunction with the cerium-increases the illuminating
power to a not inconsiderable extent.
The process can also be modified in that the incinerated thorium-body is first
impregnated with the solution or mixture of organic compounds of silicon, and
afterwards treated with the cerium solution.
The thorium-body can also in its unincinerated state be impregnated with the
organic compounds of silicon or the solution thereof, and, after incineration and
calcination, be brought in contact with the alcoholic solution of cerium as
described, the process being completed by a second calcination of short duration.
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:-
1 A process for manufacturing durable incandescent illuminating bodies by

page_text: combining with the method, described in my Letters Patent No. 30145 A.D. 1897
and involving the use of organic compounds of silicon, a preparatory process, con-
sisting in the impregnation of the fabric or other material employed, with an
aqueous solution of thorium nitrate, the material being then dried, incinerated and
calcined, substantially as set forth.
2. In connection with the manufacture of incandescent bodies in general, a pre-
paratory process consisting in the impregnation of the fabric or other material
employed, with an aqueous solution of thorium nitrate, the material being then
dried, incinerated and calcined, substantially as set forth.
3. The process for manufacturing durable incandescent bodies of the first claim,
modified in that the incinerated thorium body is first impregnated with the
mixture of organic compounds of silicon and afterwards treated with the cerium
solution, substantially as set forth.
4. The process for manufacturing durable incandescent bodies of the first claim,
modified in that the thorium body in its unincinerated state is impregnated with
the organic compounds of silicon or the solution thereof, and after incineration
and calcination is brought in contact with the alcoholic solution of cerium, the
process being then completed by a second calcination of short duration, sub-
stantially as set forth.