IMPROVEMENTS IN THE MANUFACTURE OF PRINTING INK
Year: 1848

page_text: TO ALL TO WHOM THESE PRESENTS SHALL COME, I, GEORGE
WALTER PRATT, of the City of New York, in the United States of America,
Gentleman, send greeting.
WHEREAS Her present most Excellent Majesty Queen Victoria, by Her
Royal Letters Patent under the Great Seal of the United Kingdom of Great
Britain and Ireland, bearing date at Westminster, the Twenty-ninth day of
July, One thousand eight hundred and forty-eight, in the twelfth year of Her
reign, did, for Herself, Her heirs and successors, give and grant unto me, the
said George Walter Pratt, my exors, adññors, and assigns, Her especial
licence, full power, sole privilege and authority, that I, the said George
Walter Pratt, my exors, adñiors, and assigns, or such others as I, the said
George Walter Pratt, my exors, adiñiors, and assigns, should at any time
agree with, and no others, from time to time and at all times during the
term of years therein expressed, should and lawfully might make, use,
exercise, and vend, within England, Wales, and the Town of Berwick-upon-
Tweed, and in the Islands of Jersey, Guernsey, Alderney, Sark, and Man,
and in all Her said Majesty's Colonies and Plantations abroad, the Invention
of "IMPROVEMENTS IN THE MANUFACTURE OF PRINTING INK," communicated to
me from abroad; in which said Letters Patent is contained a proviso that
I, the said George Walter Pratt, shall cause a particular description of the
nature of the said Invention, and in what manner the same is to be per-

page_text: formed, by an instrument in writing under my hand and seal, to be inrolled
in Her said Majesty's High Court of Chancery within six calendar months
next and immediately after the date of the said in part recited Letters
Patent, as in and by the same, reference being thereunto had, will more fully
and at large appear.
NOW KNOW YE, that in compliance with the said proviso, I, the said
George Walter Pratt, do hereby declare that the nature of the said Invention,
and the manner in which the same is to be performed, are fully described
and ascertained in and by the following statement thercof, that is to say:-
The Invention consists of employing rosin oil in the manufacture of printing
ink; and in order that the Invention may be most fully understood and readily
carried into effect, I will proceed to describe the means pursued by me.
I use
rosin oil, which is an article of commerce obtained by distilling rosin, and I
prepare therewith a varnish or preparation, and combine it with pigments or
coloring matter to make the colored printing inks desired. In making print-
ing inks as heretofore practised, it has been usual to employ linseed oil, and
in some instances other oils, combined with rosin, soap, and coloring matters
which, by reason of the use of linseed oil, is expansive, and the object of the
Invention is to substitute rosin oil for linseed and other oils, and thus to
cheapen the manufacture of printing ink. In making printing ink according
to this Invention I take at the rate of one pound of rosin oil, thirteen ounces
of rosin, and five ounces of yellow soap, and I apply heat thereto so as to
enable me, by stirring the mixture thoroughly, to blend the same; and I put a
larger quantity of rosin and of soap when I wish to make the ink more stiff,
and a less quantity of those matters when it is desired to be more fluid; I then
grind such varnish when cold, or nearly so, with pigments or coloring matter,
in like manner to that heretofore practised when using linseed oil, and the
manufacture of printing ink is completo according to the Invention. I would,
however, remark that I do not confine myself to the precise details herein
described, so long as rosin oil is employed in the manufacture of printing
ink.
And I would wish it to be understood that what I claim is the mode of
manufacturing printing ink herein described, whereby rosin oil is combined
with materials suitable for printing ink.
In witness whereof, I, the said George Walter Pratt, have hereunto
set my hand and seal, this Twenty-ninth day of September, in the
year of our Lord One thousand eight hundred and forty-eight.
G. W. (L.s.) PRATT.

page_text: AND BE IT REMEMBERED, that on the Twenty-ninth day of September,
in the year of our Lord 1848, the aforesaid George Walter Pratt came before
our said Lady the Queen in Her Chancery, and acknowledged the Specifi-
cation aforesaid, and all and every thing therein contained and specified, in
form above written. And also the Specification aforesaid was stamped
according to the tenor of the Statute made for that purpose.
Enrolled the Twenty-seventh day of January, in the year' of our Lord
One thousand eight hundred and forty-nine.