Improvements in and connected with the Production of Photo-relievo Impressions on Paper, Card, and other Materials.
Year: 1898

page_text: Date of Application, 5th July, 1898-Accepted, 13th Aug., 1898
COMPLETE SPECIFICATION.
Improvements in and connected with the Production of Photo-relievo
Impressions on Paper, Card, and other Materials.
I, DAN LICHTENBERG-MADSEN, of Odense, Fyen, Denmark, Printer, do hereby
declare the nature of this invention and in what manner the same is to be per-
formed to be particularly described and ascertained in and by the following state-
ment:--
This invention relates to a process of producing what may be termed photo-
relievo water-mark impressions on paper or cardboard and to the production of
matrices employed therein and for stamping cakes of soap or other plastic material.
The improved process is carried out as follows: From a photographic negative
a transparency or positive is copied upon a sensitized gelatine-coated flat glass
plate. This plate upon which the positive picture is thus obtained is immersed in
water whereby the gelatine is caused to swell and the picture to appear in relief.
From this relief whilst still wet, a plaster cast is taken and after the same has set
hard and dry a counterpart cast is taken therefrom by means of a plate of cellu-
loid previously softened by heat. These celluloid plates are then used as dies or
matrices for producing photographic water-imark impressions or for relief stamp-
ing on cakes of soap and the like but they may also directly and without difficulty
be used as matrices and in this way an indefinite number of celluloid stereotypes
can be obtained all of which exhibit the fineness and detail of the original
picture.
If the finished negative die is to be used for producing photographic water-
mark impressions the paper or card is laid between it and a flat metal plate and
placed in a press by which it is subjected to a steady and powerful pressure,
whereby the paper or cardboard will be more or less embossed in relief, the im-
pression thus produced being permanent. When the paper or card is viewed by
transmitted light the impression reproduces the picture in all its photographic
fineness of detail and definition.
For stamping cakes of soap and the like, the negative die is merely impressed
thereon, but if the matrix is to be used for stereotyping, a plate of suitably hard
celluloid should be used which must be softened by heat before being moulded
upon the plaster cast from which, after cooling down, it is removed whereby a
hard flat and exceedingly fine and correct matrix is obtained, from which an
indefinite number of celluloid stereos may be produced. Such celluloid stereo
matrices may also be produced at will from any other original block obtained by
any known process, or from type or the like which it is required to multiply by
merely pressing the block or the type upon a plate of celluloid previously softened
by heat, which when it has become hardened may be used as a matrix from which
to obtain an indefinite number of celluloid stereos.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed I declare that what
I claim is:
1. The process of producing photographic water-mark impressions on paper or
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page_text: gelatine-coated plate, swelling the gelatine so as to bring up the picture in relief,
producing a plaster cast therefrom, producing a counterpart from the cast on a
celluloid plate previously softened by heat and when the same has become
hardened subjecting the paper or cardboard to powerful pressure between the
celluloid plate and a smooth plate of metal or suitable material substantially as
specified.
2. The process set forth in the first claiming clause as applied to stamping or
impressing cakes of soap or the like substantially as described.
3. The production of stereo matrices of hard celluloid either by the process
set forth in the first claiming clause whereby the impression is produced from a
plaster cast obtained in the manner described from a photographic negative, or
produced from an original block produced by any known process, or from type
or the like, the celluloid plate being in either case softened by heat before being
subjected to pressure as described.
A. M. & WM. CLARK,
Chartered Patent Agents, 53, Chancery Lane, London.