Improved Process for Sterilizing and Preserving Liquids and Perishable Matters, and in Apparatus therefor.
Year: 1892

page_text: Date of Application, 30th Dec., 1892
Complete Specification Left, 28th Sept., 1893-Accepted, 28th Oct., 1893
PROVISIONAL SPECIFICATION.
Improved Process for Sterilizing and Preserving Liquids and
Perishable Matters, and in Apparatus therefor.
We, Dr. CARL OTTO HARZ, Professor at the Royal Veterinary University, and
GEORG DEISENHOFER, Engineer, of Kellerstrasse 29, both of Munich, in the
Empire of Germany, do hereby declare the nature of this invention to be as
follows:-
In existing processes and apparatus for sterilizing and preserving, after the
heating is effected and the vacuum formed, air passes into the receptacle or
apparatus and the whole sterilising process is rendered useless.
Now our invention has for its object to prevent this which we do by the following
process and apparatus. We employ any convenient chamber or receptacle for
containing the matters to be treated and cover it by or with a bell shaped or other
conveniently shaped cover or lid, this cover or lid being made to depend or lie in
liquid and thus to form a sealed joint preventing access of air. The cover or lid
is also furnished with an orifice in which is fixed in any convenient way a liquid or
other valve allowing of the passage outwards of the expanded gases. When the
matters are entirely sterilized the cover or valve is closed and the chamber deprived
of its warmth, the air that would consequently come into the chamber is prevented
by the sealing fluid which also absorbs all germs &c., contained in the air. The
cover may be sealed by india-rubber or by a fluid sealed subsidiary chamber
furnished with two pipes one in connexion with the main chamber and the other
with the atmosphere.
Dated this 30th day of December 1892.
R. HADDAN,
Agent for Applicants.
COMPLETE SPECIFICATION.
Improved Process for Sterilizing and Preserving Liquids and
Perishable Matters, and in Apparatus therefor.
We Dr. CARL OTTO HARZ, Professor at the Royal Veterinary University, and
GEORG DEISENHOFER, Engineer, of Kellerstrasse 29, both of Munich 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 ascertained
in and by the following statement :-
In existing processes and apparatus for sterilizing and preserving after heating is
effected and a vacuum formed, air passes into the receptacle or apparatus and the
whole sterilizing process is rendered useless. Now our invention has for its object
to prevent this, which we do by the following process and apparatus.
We employ any convenient chamber or receptacle for containing the matters to
be treated and cover it by or with a bell shaped or other conveniently shaped cover
or lid, this cover or lid being made to depend or lie in liquid and thus form a sealed
joint. The cover or lid is also furnished with an orifice in which is fixed in any
convenient way a plug or a liquid or other valve allowing of the passage outwards of
the expanded gases.
When the matters are entirely sterilized the cover or valve
is closed and the chamber being deprived of heat, the air that would consequently
come into the chamber is prevented by the sealing liquid which also absorbs all
germs etc. contained in the air. The cover may be sealed by caoutchouc or by a

page_text: fluid sealed subsidiary chamber furnished with two pipes, one in connection with
the main chamber, and the other with the atmosphere.
The annexed drawings will serve to illustrate modes of performing the invention,
Figs. 1, 2, and 3 showing three arrangements in vertical section.
G is the sterilizing vessel and is covered by a bell-shaped lid 7, the closing being
effected by a closing fluid, as shown in Figs. 1 and 2 where the lid dips into a liquid
whereby the matters to be sterilized are guarded against the access of air.
The apparatus being heated, the expanding air and vapour will come out either
through the open cover at d or when the air and vapour are but little expanded and
the cover remains closed, the closing fluid becomes depressed to the perforations l
in the side of the cover, and the vapour is able to escape thereby.
When the matters are entirely sterilized, the cover is closed by any convenient
plug d and the vessel deprived of heat, and on subsequently cooling, air will come
into the vessel which however can only happen by penetrating the closing fluid,
which absorbs all germs, atoms of dust etc. contained in the air, so that a reinfection
of the sterilized matters in the apparatus is prevented.
The closing of the apparatus can be mechanically effected as shown in Fig. 3.
where the cover b is connected to a fluid vessel a' through the rubber plug das
shown, this fluid receptacle being in connection with one pipe leading into the
vessel and one in the atmosphere as shown.
When the heating of the vessel is finished, the air that afterwards penetrates in
consequence of the vacuum originated in cooling will first pass through the liquid
in the vessel a' before arriving at the sterilizing vessel, by which means this air will
be freed from dust and germs.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed we declare that what we
claim is.
1. Improved process of sterilizing or preserving the status of sterilization of
matters of any description, whereby the air which enters the sterilizing vessel
during the cooling down of the matter is forced to take its way through an inter-
posed liquid whereby germs and impurities contained in such air are kept from the
matter sterilized.
2. Improved apparatus serving to carry out the process described in Claim 1
being the sterilizing vessel, receptacle or reservoir arranged for receiving a liquid
through which the air entering the vessel during the cooling process is forced to
pass before reaching the sterilizing chamber or matter therein.
All substantially as illustrated and described and for the purposes set forth.
Dated this 28th day of September 1893.
R. HADDAN,
Herbert Haddan & Co.,
18, Buckingham Street, Strand, London, W.C., Agent for the Applicants.