AN IMPROVED PROCESS OF PRESERVING MILK
Year: 1881

page_text: LETTERS PATENT to Heinrich Wilhelm Ludwig Otto von Roden, of the City
of Hamburg, Germany, for an Invention of "AN IMPROVED PROCESS OF
PRESERVING MILK,"
PROVISIONAL SPECIFICATION left by the said Heinrich Wilhelm Ludwig
Otto von Roden at the Office of the Commissioners of Patents on the
14th December 1881.
HEINRICH WILHELM LUDWIG OTTO VON RODEN of the City of Hamburg,
Germany. "IMPROVED PROCESS OF PRESERVING MILK."
Heretofore milk has been preserved either in a condensed state or by adding
antiseptic chemicals. Both methods injure the taste of milk thus preserved which
can very seldom be used to replace fresh milk.
The object of this Invention is to preserve milk in such a manner as not to
alter its taste and to leave it in such a degree of liquidity to allow its immediate
use after opening the bottles or vessels containing such milk.
To carry my Invention into effect I strain fresh milk directly after milking and
fill it in glass bottles or other vessels with the precaution of not filling full the
entire interior of the bottle but leaving it empty about one sixth. Then I add
some fine salad oil just enough to cover the surface of the milk about one twelfth
of an inch and heat the hottles prepared in this manner about half an hour in a
water bath. The heat must be regulated in such a manner as not to be of less
than 158 and of not more than 176 degrees of Fahrenheit.
Then the fire is removed and the water in the bath slowly cooled to 10+
degrees. After taking away the oil from the milk by means of a syphon or a
glass syringe or by any other convenient apparatus the bottles are closed either by
good plugs of cork or rubber which should be fastened with wire. Then the closed
bottles are heated again in the water bath during an hour to 194 to 208 degrees of
Fahrenheit and at last cooled in the bath to 86 degrees.
I do not limit myself to the application of salad oil but any other equivalent
thereof may be used which will protect the surface of the milk against the entry
of air after removing the air contained in the fresh milk by heating as abovo
described. Also any other means of heating the vessels to the mentioned
degrees may be employed which will replace the water bath in a satisfactory
mauner.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Heinrich Wilhem Ludwig Otto von Roden in the Great Seal Patent
Office on the 14th June 1882.
HEINRICH WILHELM LUDWIG OTTO VON RODEN of the City of Hamburg,
Germany. "IMPROVED PROCESS OF PRESERVING MILK."
Heretofore milk has been preserved either in a condensed state or by adding
antiseptic chemicals. Both methods injure the taste of milk thus preserved, which
can very seldom be used to replace fresh milk.
The object of my Invention is to preserve milk in such a manner as not to alter
its taste and to leave it in such a degree of liquidity, to allow its immediate use
after opening the bottle or vessels containing such milk.
To carry my Invention into effect I strain fresh milk directly after milking and
fill it in glass bottles or other vessels with the precaution of not filling full the
entire interior of the bottle but leaving it empty about one sixth. Then I add
some fine salad-oil-just enough-to-cover-the-surface-of-the-milk_about_one_twelfth
of an inch and heat the bottles prepared in this manner about half an hour in a
water bath. The heat must be regulated in such a manner as not to be of less
than 158 and of not more than 176 degrees of Fahrenheit.
=
Then the fire is removed and the water in the bath slowly cooled to 104
degrees. After taking away the oil from the milk by means of a syphon or a
glass syringe or by any other convenient apparatus the bottles are closed either by
good plugs of cork or rubber which should be fastened with wire. Then the
closed bottles are beated again in the water-bath during an hour to 194 to 208
degrees of Fahrenheit and at last cooled to ordinary temperature whilst immersed
and under water in the bath.
I do not limit myself to the application of salad oil, but any other equivalent
thereof may be used, which will protect the surface of the milk against the entry
of air after removing the air contained in the fresh milk by heating as above
described only the natural film of butter which is produced in heating milk being
excluded to form an object of my Invention. Also any other means of heating the
vessels to the mentioned degrees may be employed which will replace the water
bath in a satisfactory manner.
Having thus fully described my Invention, what I desire to claim and secure by
Letters Patent is,-
In the process of preserving milk in bottles or other vessels the method of
excluding air prior to sealing, which consists in covering the milk with a film or
layer of edible oil during the first heating, then removing the same stoppering and
reheating.
In witness whereof I the said Heinrich Wilhelm Ludwig Otto von Roden
have hereunto set my hand and seal this Thirteenth day of May in the
year of our Lord One thousand eight hundred and eighty two.
HEINRICH, WILHELM, LUDWIG, OTTO VON RODEN. (L.S.)