Year: 1887

page_text: Date of Application, 3rd Dec., 1887
Complete Specification Left, 3rd Sept., 1888
Complete Specification Accepted, 12th Oct., 1888
า
1, FRIEDRICH GRAEFF, doctor of philosophy, residing at Alkmaar, Kingdom of
Holland, do hereby declare the nature of the said invention to bo as follows:-
In the prepartion of the ferment or extract of rennet, usually carried out by
precipitation from the solutions thereof by means of table salt, it has heretofore not
been possible to obtain the whole quantity of the ferment, inasmuch as the remaining
liquid always retains a considerable portion of the same.
The object of my invention is to completely separate out the ferment from the
solution and to produce it in dry state.
For this purpose a pure and clear solution of the ferment, not containing above
10 per cent. of table salt, is evaporated to dryness in vacuo at a temperature not
exceeding 40° centigr. The residue is reduced to powder, which is thereupon washed
with concentrated solution of table salt in view of removing the coloring matter
present. The product thus obtained is dried again and mixed with an innocuous
soluble salt, for instance with table salt.
Dated the Thirtieth day of November 1887.
FRIEDRICH GRAEFF.
By his Agent, Carl Pieper.

page_text: I, FRIEDRICH GRAEFF, doctor of philosophy, residing at Alkmaar, Kingdom of
Holland, 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 :-
My invention relates to the production of dry ferment of rennet from extract of
the rennet, and its object is to completely separate out the ferment from the liquid
extract and to produce it in dry state.
In the preparation of the dry ferment from extract of the rennet, usually carried
out by precipitation from the liquid extract by means of table-salt, it has heretofore
not been possible to obtain the whole quantity of the ferment, inasmuch as the
remaining liquid always retains a considerable portion of the same.
In order to obviate this inconvenience a pure and clear extract of rennet, not
containing above 10 per cent. of table-salt, is evaporated to dryness in vacuo at a
temperature not exceeding 40 degrees centigrade. The residue is reduced to powder,
which is thereupon washed with concentrated solution of table-salt in view of removing
the coloring matter present, and finilly it is dried again. It is advantageous to
employ in the process extracts of high fermentative power which are free from
preserving substances, such as boracic acid and thymol.
The product obtained as described is a powder which is completely soluble in water.
For rendering the same a marketable article it is mixed with a suitable quantity of an
innocuous salt, for instance with table-salt.
Having now particularly described and ascertained the nature of this inven-.
tion and in what manner the same is to be performed, I declare that what I
claim is:
The process of producing dry ferment of rennet which consists in evaporating
liquid extract of rennet to dryness in vacuo at a temperature not exceeding 40° centigr.,
comminuting the residue, washing the same with concentrated solution of table-salt
and drying it again, substantially as and for the purpose described.
Uke Le Iarnath dox of
CO
Diten Lie I mrneth dow of
CARL PIEPER,
Agent for Applicant.
Haseltine, Lake & Co.,
45, Southampton Buildings, London.