IM- PROVEMENTS IN THE METHOD OF TREATING GREASE FOR THE PURIFICATION THEREOF, TO BE USED IN THE MANUFACTURE OF SOAP, AND FOR OTHER PURPOSES
Year: 1875

page_text: LETTERS PATENT to John Hopkinson, of 49, Southfield Square, Brad-
ford, in the County of York, Manager, for the Invention of "IM-
PROVEMENTS IN THE METHOD OF TREATING GREASE FOR THE PURIFICATION
THEREOF, TO BE USED IN THE MANUFACTURE OF SOAP, AND FOR OTHER
PURPOSES."
Sealed the 29th October 1875, and dated the 5th May 1875.
PROVISIONAL SPECIFICATION left by the said John Hopkinson. at
the Office of the Commissioners of Patents, with his Petition, on
the 5th May 1875.
I, John HoРKINSON, of 49, Southfield Square, Bradford, in the
County of York, Manager, do hereby declare the nature of the said
Invention for "IMPROVEMENTS IN THE METHOD OF TREATING GREASE FOR THE
PURIFICATION THEREOF, TO BE USED IN THE MANUFACTURE OF SOAP, AND FOR OTHER
PURPOSES," to be as follows :—
The object of my Invention is to purify Yorkshire or any other kind of
grease in which the yolk of wool or any other non-saponifiable fatty
substances are held in solution.

page_text: Whereas up to the present time the grease so extracted has been of
use only as a lubricant for the wheels of gearing or distillation. In the
latter case the impurities I propose to remove have caused a nuisance to
the neighbourhood in which the same has been done.
By means of my Invention the grease so extracted and purified may
be manufactured into soap or used for any other purpose without causing
any annoyance to the inhabitants adjacent to the works.
I accomplish this in the following manner :-Of the grease to be
purified, I make a lime or insoluble soap, and dissolve out the impure
fat with bisulphide of carbon or any other suitable solvent under
pressure or otherwise.
In order to obtain the impure fat I cause the solution of impure fat
in bisulphide of carbon to be run into a still, and distil off the bi-
sulphide of carbon ready for another operation, the impure fat remaining
in the still. *
In order to obtain the pure fatty acids, I take the purified lime soap
and decompose it by means of an acid. I prefer hydrochloric, which
liberates the fatty acids from the lime base.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said John Hopkinson in the Great Seal Patent Office a
on the 4th November 1875.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JOHN
HOPKINSON, of 49, Southfield Square, Bradford, in the County of York,
Manager, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her 2
Letters Patent, bearing date the Fifth day of May, in the year of our
Lord One thousand eight hundred and seventy-five, in the thirty-
eighth year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto me, the said John Hopkinson, Her special licence
that I, the said John Hopkinson, my executors, administrators, and a
assigns, or such others as I, the said John Hopkinson, my executors,
administrators, and assigns, should at any time agree with, and no others,
from time to time and at all times thereafter during the term therein

page_text: expressed, should and lawfully might make, use, exercise, and vend,
within the United Kingdom of Great Britain and Ireland, the Channel
Islands, and Isle of Man, an Invention for "IMPROVEMENTS IN THE METHOD
OF TREATING GREASE FOR THE PURIFICATION THEREOF, TO BE USED IN THE MANU-
FACTURE OF SOAP, AND FOR OTHER PURPOSES," upon the condition (amongst
others) that I, the said John Hopkinson, my executors or administrators,
by an instrument in writing under my, or their, or one of their hands and
seals, should particularly describe and ascertain the nature of the said
Invention, and in what manner the same was to be performed, and cause
the same to be filed in the Great Seal Patent Office within six calendar
months next and immediately after the date of the said Letters Patent.
NOW KNOW YE, that I, the said John Hopkinson, 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 :-
The object of my Invention is to purify Yorkshire grease, black oil,
shoddy oil, or any other kind of hard or soft grease in which the yolk of
wool or any other non-saponifiable fatty substances are held in solution.
Whereas up to the present time the above-named greases have been
of use only as a lubricant for the wheels of gearing or for distillation.
In the latter case the impurities I propose to remove have caused a
nuisance to the neighbourhood in which the same has been carried on.
By means of my Invention the greases so extracted and purified may
be manufactured into soap, or used for any other purpose for which
pure fatty acids are used without causing any annoyance to the inhabi-
tants adjacent to the works.
I accomplish this in the following manner:-Of the grease to be
purified I make what is known as a lime or insoluble soap (any other
alkaline earth would do, lime being mentioned as the cheapest) and
dissolve out the non-saponifiable fat with bisulphide of carbon or any
other suitable solvent under pressure or otherwise.
In order to obtain the non-saponifiable fat, I cause the solution of
non-saponifiable fat in bisulphide of carbon or other suitable solvent to be
run into a still, and distil off the bisulphide of carbon or other solvent
ready for another operation, the non-saponifiable fat remaining in the
still,

page_text: In order to obtain the pure fatty acids, I take the purified lime soap
and decompose it by means of an acid. I prefer hydrochloric, which
liberates the fatty acids from the lime base.
In witness whereof, I, the said John Hopkinson, have hereunto
set my hand and seal, this Second day of November, in the
year of our Lord 1875.
Witness,
JOHN WAUGH,
Engineer & Patent Agent,
29, Tyrrel St.,
Bradford.
JOHN HOPKINSON. (L.S.)