An Improved Plastic and Hardenable Substance, and a Process for its Manufacture.
Year: 1898

page_text: Date of Application, 11th Oct., 1898-Accepted, 26th Nov.,
1898
COMPLETE SPECIFICATION.
An Improved Plastic and Hardenable Substance, and a Process for its
Manufacture.
I, CLEMENS DÖRR, of Germersheim, Germany, Town Architect, 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
statement:
―
My invention relates to an improved plastic and hardenable substance and a
process for its manufacture. The composition is formed by the mixture of certain
materials with superheated tar. In carrying the process into effect I proceed in
or in about the following manner: -I heat in a suitable vessel tar, either of
the ordinary kind such as is produced as a bye product in the manufacture of
gas or of any other kind or I take any substance or substances of like nature.
The heating of the tar is effected at a certain well defined temperature, namely,
that at which the sulphur compounds of the tar are separated, which is indicated
by intense yellow colouring suddenly acquired by the fumes. This condition
only continues however for a certain time and it is of essential importance that
the following operations be carried out during this period. As soon therefore as
the thermometer attached to the boiler indicates that the suitable temperature
has been reached the materials to be mixed with the tar are added, the materials
varying according to the purpose to which the product is to be applied. These
materials may be either finely pulverised inorganic substances or organic waste
substances. Of the former I will instance minerals, gravel, sand, dry earth,
pieces of class, scraps of iron, slag, asbestos and the like, and of the latter I
would mention wood, shavings, rags, paper, wool, cotton and hair, any of the
materials which require it being treated by any suitable process to render them
capable of resisting the degree of heat to which they are submitted in the
process.
While the substances are being added to the tar the mass must be thoroughly
mixed and kept uniformly at the above temperature as any variation therein
is detrimental to the proper incorporation and amalgamation of the ingredients.
The material thus obtained is of a plastic nature at the above temperature, but
in cooling combines to form a hard body. It can therefore before cooling com-
mences be cast or moulded in any desired manner with or without the assistance
of pressure to give it greater firmness and closeness.
As suitable proportions of tar and added materials I would instance as particu-
larly satisfactory one part of the former to seven parts of the latter.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I claim is:-
1. Improved hard cement-like substances manufactured from superheated tar
and like products in combination with inorganic or organic materials, substantially
as described in the above specification.

page_text: 2. A process for manufacturing the hard cement-like substances which are
the subject matter of the above Claim 1, the said process consisting essentially
in adding inorganic or organic materials to tar or like products which has or
have been heated to, and while it or they remain at, the temperature at which
the sulphur compounds are given off, the whole substantially as described in
the above specification.
3. Hard cement-like substances composed of one part of superheated tar or
like products and seven parts of added inorganic or organic materials, sub-
stantially as described in the above specification.
Dated this 4th day of October 1898
HUGHES & YOUNG,
23, Coleman Street, E:C., Agents.