IMPROVEMENTS IN THE MANUFACTURE OF PAPER PULP OR HALF STUFF
Year: 1872

page_text: LETTERS PATENT to Henry Page, of Market Buildings, Mincing
Lane, in the City of London, Merchant, for the Invention of "Im-
Sealed the 6th May 1873, and dated the 7th November 1872.
PROVISIONAL SPECIFICATION left by the said Henry Page at the
Office of the Commissioners of Patents, with his Petition, on the
7th November 1872.
I, HENRY PAGE, of Market Buildings, Mincing Lane, in the City of
3 London, do hereby declare the nature of the said Invention for
"IMPROVEMENTS IN THE MANUFACTURE OF PAPER PULP OR HALF STUFF," to be as
follows:-
This Invention consists in manufacturing paper pulp or half stuff
from spent hops, either alone or in combination with any other paper-
making material or materials.
The following is an example of my said Invention:-The spent hops
are placed in a suitable boiler and boiled in a solution of caustic soda or

page_text: other suitable alkali, under steam pressure, in the proportion of about
forty gallons of the alkali to every hundredweight of the spent hops, I
continue the boiling for about six hours, more or less, according to the
strength of the alkali and the pressure of steam in the boiler. The pulp
is freed from the alkali by washing and may then be bleached in the
usual way.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Henry Page in the Great Seal Patent Office
on the 7th May 1873.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, HENRY
PAGE, of Market Buildings, Mincing Lane, in the City of London,
send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Seventh day of November, in the
year of our Lord One thousand eight hundred and seventy-two, in the
thirty-sixth year of Her reign, did, for Herself, Her heirs and succes-
sors, give and grant unto me, the said Henry Page, Her special licence
that I, the said Henry Page, my executors, administrators, and
assigns, and such others as I, the said Henry Page, 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 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
MANUFACTURE OF PAPER PULP OR HALF STUFF," upon the condition (amongst
others) that I, the said Henry Page, 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 Henry Page, do hereby declare
the nature of my said Invention and in what manner the same is to

page_text: be performed, to be particularly described and ascertained in and by the
following statement, that is to say :—
This Invention consists in manufacturing paper pulp or half stuff in
the following manner:-I take spent hops either alone or in combination
with any other known paper-making material or materials, and place
them in a suitable revolving or fixed boiler (I prefer to use either a re-
volving boiler or a boiler with a stirrer or agitator therein); I then mix the
hops with a solution of caustic soda or other suitable alkali, at a strength
of two to ten degrees Baumé in the proportion of about 40 gallons of
the alkali to every 112 lbs. of the spent hops. Into the said boiler I
admit steam of a pressure below 90 pounds to the square inch for the
purpose of boiling the said spent hops (I have found a pressure of 50
pounds to the square inch answer well), and I continue the boiling for
about six hours, more or less, according to the strength of the alkali
and the pressure of steam in the boiler. After boiling I place the
boiled hops in a pug mill or beater and operate thereon until it is
reduced to pulp. The pulp may be freed from the alkali by washing,
by preference in hot water of about 180 degrees Fahrenheit and then be
bleached in the usual way.
«
Having now described the nature and object of my said Invention for
Improvements in the Manufacture of Paper Pulp or Half Stuff," and
the means by which it may be effected, I hereby declare my Invention
to consist in, and I claim manufacturing paper pulp or half stuff in the
manner above described.
In witness whereof, I, the said Henry Page, have hereunto set
my hand and seal, this Fifth day of May in the year of our
Lord One thousand eight hundred and seventy-three.