Improvements in or applicable to Soap in Tablets, Cakes, or Bars.
Year: 1894

page_text: Date of Application, 6th July, 1894-Accepted, 11th Aug., 1894
COMPLETE SPECIFICATION.
Improvements in or applicable to Soap in Tablets, Cakes, or Bars.
I, FEODOR HEILBRONN of 109 Priory-park Road, Kilburn, in the County of
London, Manufacturer do hereby declare the nature of my said invention and in
what manner the same is to be performed to be particularly described and
ascertained in and by the following statement :-
Soap in cakes, tablets or bars when exposed to air is likely to deteriorate, partly
by becoming rancid, partly by evaporation of the volatile oils incorporated
therewith (either for the purpose of perfuming the soap, for imparting medicinal
properties thereto, or for both these purposes) and partly by alteration of colour
caused by chemical changes in the constituents of the soap.
Now the object of this invention is to treat tablets, cakes or bars of soap in such
a manner that they may retain their odour, appearance, colour, and other
characteristic properties for an indefinite time, although exposed to the ordinary
atmospheric influences.
This object I attain by coating, or covering each tablet, cake, or bar with a thin,
and preferably transparent, film which, whilst resisting atmospheric influences,
does not affect the quality of the soap, and is readily removed when the tablet,
cake, or bar, is first used: In carrying this invention into practice, I prepare the
tablet or the like in the usual manner, when the same is finished, I immerse it in an
aqueous solution of gelatine, made more or less dense according to circumstances.
In most cases the solution will be uncoloured; when the film of gelatine deposited
on the soap by the immersion has become dry, it forms a transparent, but impervious
coating. If preferred a little colouring matter may be added to the gelatine, and
in some cases a small proportion of glycerine.
The film or coating of gelatine so deposited is of no appreciable thickness and
therefore does not materially affect the weight of the tablet or the like.
When the tablet, bar, or cake so prepared is first used, the gelatine dissolves and
leaves the pure soap behind in as excellent condition, as when it left the maker.
In some cases melted wax, spermaceti, ozokerit and similar materials may be used
instead of the solution of gelatine.
From the foregoing it will be readily understood that, although I prefer to make
the coating or film quite thin, yet it may be produced of substantial thickness if
desired, so that the tablet or the like requires no box or case for exhibition in
show-cases, shop windows and so forth. This may be attained with gelatine by
making the solution of sufficient strength, in cases where it is not convenient or
practicable to thicken the solution to the desired extent, repeated dipping may be
resorted to.
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:
Covering or coating tablets, bars or cakes of soap with a covering coating
covering or film of gelatine, wax, spermaceti, ozokerit, or other suitable material,
applied as, and for the purpose hereinabove set forth.
Dated. London, this 6th day of July 1894
BERNHARD DUKES,
226, High Holborn, W.C., Agent for the Applicant.