Year: 1894

page_text: I, FRIEDERICH ERNST SAILFELD, of Ganisker, Hannover, in the Empire of..
Germany, Chemist, do hereby declare the nature of this invention to be as
follows:
This invention has relation to the production of a fish extract, and is effected in
the following manner :-
Dead fish of any desirable kind is taken, and stripped of the outside scales and
skin and the entrails, head, tail, fins and other parts are removed, leaving the whole
of the remaining flesh to be treated, with or without the bones and the eggs (if
good and sound). The latter, when used, are properly cleaned by washing the
same with warm water in a suitable washing apparatus.
This separation of the useful and fleshy parts from the offal parts is thus
effected, and the extract is made therefrom, whilst the residual parts are used as a .
manure. The flesh is properly washed and cut up into small parts, and put into a
suitable apparatus containing water, or sufficient water is added thereto for
dissolving the nutritious portions of the fish and also for the cooking of the same..
The cooking or rendering down of the said fish for forming the extract takes
place in a closed vessel, with or without a stirring apparatus.
The vessel may be
Surrounded by a steam jacket, whilst the interior may be provided with a steam
coil, or the interior may have a steam coil, or the coil may be disposed between the
vessel and the steam jacket.
By passing steam through both the steam jacket and coil, or either of them, the
mixture being rendered down within the vessel, may be heated to a temperature of
about 300 degrees Fahrenheit. It is undesirable to heat the matter to higher
temperature than 300 degrees, as by so doing, the same would become damaged in
respect of extracting from the fish, matters not requiring to be removed, but in
order to increase the quality of the extract, the pressure of the air within the
vessel is increased to about seven atmospheres by also introducing into the vessel
warm and compressed air.
After the fish to be extracted has been sufficiently exposed to the aforesaid
pressure and temperature the cooking is accelerated by a stirring apparatus located
within the vessel, and the fish and fluid is removed by the internal pressure or
otherwise into a second vessel arranged to receive it. This having been done, the
fluid parts are removed from the unrequired parts by a filter press or other
desirable means.
The liquid part thus run off, which consists of a brown fluid, containing the.
extract, is then again heated in a vessel surrounded by a steam jacket. The said
vessel may be funnel or hopper shaped, in order to better separate the fats from the
extract matter. The fatty matter is removed by skimming, leaving a brown fluid,
which is subsequently concentrated in a vacuum apparatus, until the desired
consistency is obtained, hence a fish extract, which is used as a food, whilst the
residues may be employed as manure.
Dated this 29th day of December 1894.

page_text: I, FRIEDERICH ERNST SAHLFELD, of Ganisker, Hannover, in the Empire of
Germany, Chemist, 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:-
This invention has relation to the production of a fish extract, and is effected
in the following manuer :-
Dead fish of any desirable kind is taken, and stripped of the outside scales and
skin and the entrails, head, tail, fins and other parts are removed, leaving the
whole of the remaining fish to be treated, with or without the bones and the eggs
(if good and sound). The latter, when used, are properly cleaned by washing the
same with warm water in a suitable washing apparatus.
This separation of the useful and fleshy parts from the offal parts is thus effected,
and the extract is made therefrom, whilst the residual parts are used as a manure.
The flesh is properly washed and cut up into small parts, and put into a suitable
apparatus containing water, or sufficient water is added thereto for dissolving the
nutritibus portions of the fish and also for the cooking of the same.
The cooking or rendering down of the said fish for forming the extract takes
place in a closed vessel, with or without a stirring apparatus. The vessel may be
surrounded by a steam jacket, or the interior of the same may be provided with a
steam coil, or a steam jacket combined with a steam coil may be employed together
for the same purpose.
By passing steam through the steam jacket or the coil, or both of them, the
mixture being rendered down within the vessel may be heated to a temperature of
about 300 degrees Fahrenheit. 10 is undesirable to beat the matter to a higher
temperature than about 300 degrees, as by so doing, the fish extract would be
reduced in quality or strength..
In order to increase the quantity of the extract, the pressure in the vessel must
be increased' to about seven atmospheres by introducing into the vessel compressed
air, which can be cold, or if necessary, warm.
After the fish to be extracted has been sufficiently exposed to the aforesaid
pressure and temperature the operation may be accelerated by a stirring apparatus
located within the said: vessel and the fish and fluid is removed by the internal
pressure or otherwise into a second vessel arranged to receive it.
This having
been done, the fluid parts are removed from the unrequired parts by a filter press
or other desirable means.
The liquid part thus run off, which consists of a brown fluid, containing the
extract, is then again heated in a vessel surrounded by a steam jacket. The said
vessel may be funnel or hopper shaped, in order to better separate the fats from
the extract matter. The fatty matter is removed by skimming, leaving a brown
fluid, which is subsequently concentrated in a vacuum apparatus, until the desired
consistency is obtained, hence a fish extract, which is used as a food, whilst the
residues may be employed as manure.
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 :-
A fish-extract, produced from prepared fish by treating the same with water
in a closed vessel at a temperature of about 300 degrees Fahrenheit and under
a high atmospheric pressure, such as about seven atmospheres obtained by

page_text: introducing compressed air into the said vessel; and which process is conducted in
the way and under the conditions substantially as herein described and set forth.
Dated this 21st day of August 1895.
FRIEDERICH ERNST SAHLFELD,
By Henry Skerrett,
24 Temple Row, Birmingham, Agent for Applicant.