IMPROVEMENTS IN IMPERVIOUS COMPOUNDS APPLICABLE WHERE INDIA-RUBBER, GUTTA PERCHA, OR SUCH LIKE RESINS OR GUMS ARE USED
Year: 1866

page_text: LETTERS PATENT to John Macintosh, of North Bank, Regent's Park,
in the County of Middlesex, for the Invention of "IMPROVEMENTS IN
IMPERVIOUS COMPOUNDS APPLICABLE WHERE INDIA-RUBBER, GUTTA PERCHA, OR
SUCH LIKE RESINS OR GUMS ARE USED."
Sealed the 8th May 1866, and dated the 12th March 1866.'
PROVISIONAL SPECIFICATION left by the said John Macintosh at the
Office of the Commissioners of Patents, with his Petition, on the
12th March 1866.
I, JOHN MACINTOSH, of North Bank, Regent's Park, in the County of
Middlesex, do hereby declare the nature of the said Invention for "IMPROVE-
MENTS IN IMPERVIOUS COMPOUNDS APPLICABLE WHERE INDIA-RUBBER, GUTTA PERCHA.
OB SUCH LIKE RESINS OR GUMS ARE USED," to be as follows:-
My Invention consists in mixing caoutchouc, gutta percha, or balata and
their solvents with paraffin or stearic acid; by preference I use coal tar
naptha for the solvent. This compound is brought into a homogeneous
plastic state by means of mixing rollers, or in the masticator, as is well
understood, and may be applied where india-rubber or its compounds are
applicable. The compound may be brought into a plastic homogeneous
state by means of heat, as described in a Patent granted to me, No. 1560, on
[Price 8d.1

page_text: the 27th June 1860, and may be rolled or spread by suitable machinery into
sheets, or moulded or formed into articles and vulcanised in the same way as
india-rubber. With regard to the proportions or quantities of the said
mentioned compounds they may be varied at the discretion of the operator,
and in making any of the compounds the toughness and elasticity of such
will be increased by increasing the quantity of india-rubber, gutta percha,
or balata. The proportions I use are 25 parts by weight of caoutchouc,
gutta percha, or balata to 75 parts by weight of paraffin or stearic acid,
with 25 parts by weight of solvent, but these proportions may be varied
according to the quality of the caoutchouc, gutta percha, or balata
employed.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said John Macintosh in the Great Seal Patent Office on the
12th September 1866.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JOHN
MACINTOSH, of North Bank, Regent's Park, in the County of Middlesex,
send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Twelfth day of March, in the year of our
Lord One thousand eight hundred and sixty-six, in the twenty-ninth year
of Her reign, did, for Herself, Her heirs and successors, give and grant
unto the said
Her special licence that I, the said John Macintosh,
my executors, administrators, and assigns, or such others as I, the said
John Macintosh, 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 IMPERVIOUS COMPOUNDS APPLICABLE WHERE INDIA-RUBBER
GUTTA PERCHA, OR SUCH LIKE RESINS OR GUMS ARE USED," upon the condition
(amongst others) that I, the said John Macintosh, my executors or admi-
nistrators, by an instrument in writing under my, or their, or one of their
bands 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.

page_text: NOW KNOW YE, that I, the said John Macintosh, do bereby 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:-
My Invention consists in mixing caoutchouc, gutta percha, or balata and
their solvents with paraffin or stearic acid; by preference I use coal tar
naptha for the solvent. This compound is brought into a homogeneous plastic
state by means of mixing rollers, or in a masticator, as is well understood
and may be applied where india-rubber or its compounds are applicable.
The compound may be brought into a plastic state by meaus of heat, as
described in a Patent granted to me, No. 1560, and dated the 27th June
1860, and may be rolled or spread by suitable machinery into sheets or
moulded or formed into articles and vulcanised in the same way as india-
rubber. With regard to the proportions or quantities of the said mentioned
substances they may be varied at the discretion of the operator, and in
making any of the compounds the toughness and elasticity of such will be
increased by increasing the quantity of india-rubber, gutta percha, or balata.
The proportions I use are 25 parts by weight of caoutchouc, gutta percha,
or balata to 75 parts by weight of paraffin or stearic acid with 25 parts by
weight of solvent, but these proportions may be varied according to the
quality of the caoutchouc, gutta percha, or balata employed or the articles to
be produced.
The above compound may be employed for coating or saturating cloth,
felt, or other fibrous material, or the fibres of ropes; or the compound may be
passed through rollers together with carded cotton or other fibre, which
compound being crushed in with the fibres produces a strong cloth or felt
which may be used for packing cloth or the sheathing of ships, as is well
understood; or the compound may be rolled into sheets and be used for the
preservation of meats, fruits, &c., by enveloping the articles to be preserved
in the sheet and cementing their edges together by heat or otherwise. When
it is desired to preserve stone, wood, or metallic surfaces, I dilute the plastic
compound with a solvent to a suitable consistency, and it may be colored
and applied with a brush and used in lieu of the ordinary paint or varnish,
and when a dark color is not objectionable I use the unrefined or pitchy
deposits of paraffin or stearic acid in combination with caoutchouc, gutta
percha, or balata, and their solvent or solvents.
In my Patent, No. 1560, dated 27th June 1860, I use caoutchouc or
gutta percha in combination with paraffin or stearic acid and their deposits
without the use of solvents, but I now find that the compound in combination

page_text: with a solvent or solvents may be used for all purposes to which caoutchouc,
gutta percha, or balata can be applied.
Having now described the nature of my said Invention I would have
it understood that I do not confine myself to any precise proportions so
long as the peculiar features of my Invention be retained; but what I claim
and desire to secure by these Letters Patent is, the admixture of caoutchouc,
gutta percha, or balata, either separately or in combination with paraffin or
stearic acid, as herein-before described.
In witness whereof, I, the said John Macintosh, have hereunto set
my hand and seal, this Twelfth day of September, in the year of
our Lord One thousand eight hundred and sixty-six.
JOHN MACINTOSH. (L.s.)