Improvements in the Manufacture of Lithographic Plates.
Year: 1890

page_text: Date of Application, 15th May, 1890
Complete Specification Left, 14th Feb., 1891-Accepted, 4th Apr.,
1891
PROVISIONAL SPECIFICATION.
Improvements in the Manufacture of Lithographic Plates.
I, WILLIAM ROBERT LOCKING, Secretary of The Patent Lithographic Zinc
Plate Co., Ld., of India Chambers, Queen's Dock Side, in the Borough of
Kingston-upon-Hull (a communication to me from abroad by Oskar Kindermann,
of Lindenau, Leipsig, in the Empire of Germany), do hereby declare the nature of
this invention to be as follows:-
Zinc plates are prepared by being passed over a fine sand blast until their surface
is uniformly dull. They are then washed with a sponge dipped in clean water having
in it a few drops of the following mixture:-chlorate of zinc, tetrachloride of tin,
nitric acid, hydrochloric acid, water. The moisture is wiped off with blotting
paper or similar material and the same mixture is then applied with a fine sponge
and spread evenly over the surface by a brush applied softly in long strokes until
the surface is dry. When the plate is dry the dust on the surface is removed with
a soft brush and it will be found that the mixture has combined with the zinc of the
plate to form a surface which can be used for any purpose in lithographic printing
for which stones are used. The advantages of these plates are that they cost very
much less than the cheapest lithographic stone, that they are lighter and casier to
work with, take up less room and capital for storing, and produce, results equal to
the best stone.
The following proportions work well :--
Chlorate of zinc
Tetrachloride of tin
Nitric acid
Hdhlarin said
100 parts
25
"
2
"
2
W. K. LUCKING.
COMPLETE SPECIFICATION.
Improvements in the Manufacture of Lithographic Plates.
J, WILLIAM ROBERT LOCKING, Secretary of The Patent Lithographic Zinc
Plate Co., Ld., of India Chambers, Queen's Dock Side, in the Borough of
Kingston-upon-Hull (a communication to me from abroad by Oskar Kindermann,
of Lindenau, Leipsig, in the Empire of Germany), 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 :-
Zinc plates are prepared by being passed over a fine sand blast until their surface
is uniformly dull. They are then washed with a sponge dipped in clean water
having in it a few drops of the following mixture:-chloride of zinc, tetrachloride
of tin, nitric acid, hydrochloric acid, water. The moisture is wiped off with blotting
paper or similar material and the same mixture is then applied with a fine sponge
and spread evenly over the surface by a brush applied softly in long strokes until
the surface is dry. When the plate is dry the dust on the surface is removed with
a soft brush and it will be found that the mixture has combined with the zinc of
the plate to form a surface which can be used for any purpose in lithographic
printing for which stones are used. The advantages of these plates are that they

page_text: cost very much less than the cheapest lithographic stone, that they are lighter and
easier to work with, take up less room and capital for storing, and produce results
equal to the best stone.
The following proportions work well :-
:-
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
1. The process of manufacturing lithographic plates by treating zinc sheets with
a solution containing chloride of zinc and tetrachloride of tin.
2. The process of manufacturing lithographic plates by treating zinc sheets with
chloride of zinc, tetrachloride of tin, nitric acid, hydrochloric acid and water in
about the proportions specified.
3. The process of manufacturing lithographic plates by first dulling zinc sheets
and then brushing them with chloride of zinc, tetrachloride of tin, nitric acid, hydro-
chloric acid and water in about the proportions specified.
4. The process of manufacturing lithographic plates substantially as described.
.
Dated this 3rd day of February 1801
W. R. LOCKING.