Year: 1887

page_text: Date of Application, 15th July, 1887
Complete Left, 13th Apr., 1888
Complete Accepted, 18th May, 1888
We EMILE AUGUSTE SENGEL, Merchant and LOUIS FERDINAND DOBLER Engineer
both of 95 Boulevard Beaumarchais Paris, France, do hereby declare the nature of
this invention to be as follows:-
The object of this invention is the production of a cloth specially designed to be
used in place of writing, drawing or similar paper or parchment, the said cloth being
also applicable for painting, printing or other purposes in which paper or parchment
is employed.
This cloth or fabric, in order that it shall fulfil the necessary conditions, must
possess the following properties that is to say, it must not be liable to be injuriously
affected by water nor to distortion or wrinkling and must possess a consistency similar
to that of paper.
In order to impart to this fabric these qualities, I prepare the same in the following
manner, that is to say:
In carrying the said invention into practice I apply either to one or both surfaces
of suitable cloth, a more or less concentrated solution of gelatine which is rendered
insoluble in water by any suitable chemical substance such, for example, as bichromate
of potash, gallic acid, tannin or other body answering the same purpose. This solution
may contain inert bodies or substances in suspension for the purpose of imparting
colour to the fabric, of rendering it absolutely opaque, or of giving to its surface any
desired appearance. The solution may also contain a substance sensitive to light in
order to obtain blues or other photographic reproductions.
The cloth is placed in a solution of gelatine to which has been added a certain pro-
portion of bichromate of potash to render it insoluble in water. The cloth or fabric,
when taken from this bath, is dried, care being had that it is kept tightly stretched
during this operation. In order to give a uniform surface to the cloth or fabric it
may be calendered with or without heat, either before or after the gelatine has become
completely dry, but in the latter case it is necessary to slightly damp the cloth or
fabric before subjecting it to the calendering operation.

page_text: If, for any reason, it should be desired to apply the solution to one side only of the
fabric, this may be accomplished with facility by means of a brush, a sponge or a
roller, either by hand or by mechanical means.
The uses to which this parchment cloth may be applied are numerous. It forms, as
a substitute for ordinary paper, a material which is untearable and not affected by wet
or danip, and it may be advantageously employed for the following articles or purposes
viz. envelopes, tickets, mechanical or other drawings, photographic proofs, tracings,
impressions of all kinds and fancy articles such for example as letter paper, visiting
cards, and the like.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C.,
Agents for the Applicants.

page_text: COMPLETE SPECIFICATION.
An Improved Manufacture of Gelatinized Cloth or Artificial
Parchment.
We EMIL AUGUSTE SENGEL, Merchant and Louis FERDINAND DOBLER, Engineer,
both of 95 Boulevard Beaumarchais, Paris, France, 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 :-
The object of this invention is the production of a cloth specially designed to be
used in place of writing drawing or similar paper or parchment the said cloth being
also applicable for painting printing and other purposes in which paper or parchment
is employed.
This cloth or fabric, in order that it shall fulfil the necessary conditions must possess
the following properties that is to say; it must not be liable to be injuriously affected
by water nor to distortion or wrinking and must possess a consistency similar to that
of paper.
In order to impart to this fabric these qualities I prepare the same in the following
manner that is to say.
In carrying the said invention into practice I apply either to one or both surfaces of
suitable cloth a more or less concentrated solution of gelatine which is rendered
insoluble in water by any suitable chemical substance such for example as bichromate
of potash, gallic acid, tannin, or other body answering the same purpose. This
solution may contain inert hodies or substances in suspension for the purpose of
imparting colour to the fabric, of rendering it absolutely opaque, or of giving to its
surface any desired appearance. The solution may also contain a substance sensitive
to light in order to obtain blues or other photographic reproductions.
The cloth is placed in a solution of gelatine to which has been added a certain pro-
portion of bichromate of potash to render it insoluble in water. The cloth or fabric
when taken from this bath is dried, care being had that it is kept tightly stretched during
this operation. In order to give a uniform surface to the cloth or fabric it may be
calendered with or without heat, either before or after the gelatine has become com-
pletely dry but in the latter case it is necessary to slightly damp the cloth or fabric
before subjecting it to the calendering operation.
If for any reason it should be desired to apply the solution to one side only of the
fabric this may be accomplished with facility by means of a brush, a sponge or a roller
either by hand or by mechanical means.
The uses to which this parchment cloth may be applied are numerous.
It forms as
a substitute for ordinary paper a material which is untearable and not affected by wet
or damp and it may be advantageously employed for the following articles or purposes
riz. Envelopes, tickets, mechanical or other drawings, photographic proofs, tracings,
impressions of all kinds and fancy articles, such for example as letter-paper, visiting
cards, and the like.

page_text: Having now particularly described and ascertained the nature of our said
invention, and in what manner the same is to be performed we declare that what
we claim is :-
The above described parchment formed of a cloth or fabric covered on one or both
surfaces with a layer of gelatine pure or mixed with inert bodies and rendered
insoluble by the addition of bichromate of potash. This preparation enabling the
fabric to preserve its form and remain unaffected by the action of humidity, in
order to be adapted for writing, drawing, washes, impressions, and other purposes as
herein before described.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C.,
Agents for the Applicants.