A Process for Hardening and Preserving Natural and Artificial Stone and other like Building Material.
Year: 1892

page_text: Date of Application, 23rd June, 1892
Complete Specification Left, 22nd Mar., 1893-Accepted, 22nd Apr., 1893
PROVISIONAL SPECIFICATION.
A Process for Hardening and Preserving Natural and Artificial
Stone and other like Building Material.
We, WALTER HENRY TALBOT, of Brackenhurst, Merton in the County of
Surrey, Stationer and CHARLES HARRISON VENNING of Shortlands in the
County of Kent, Secretary to a company, do hereby declare the nature of this
invention to be as follows:-
Our invention relates to a process for hardening natural or artificial stone,
applicable chiefly to stones of the softer kinds, so as to make them capable of
taking a polish, and for preserving stone and like building materials generally by
impregnating them with substances that prevent access of damp or other destructive
influences.
For this purpose, we first thoroughly dry the stone or other material, heating it,
if necessary, to a temperature not exceeding 250° F. We next immerse the
material, after it is cooled, in a solution of alkaline silicate, preferably silicate of
potash, and allow. it to remain therein until it is thoroughly impregnated with the
silicate. We then, after washing the surface, immerse the stone or material in a
strong solution of alum or aluminium sulphate, and let it remain until fully
impregnated. Finally, we heat the stone or material gradually to about 350° F. at
which heat it is maintained for several hours, and then, being allowed to cool
gradually, it is fit for use.
Dated this 23rd day of June 1892.
ABEL & IMRAT,
Agents for the Applicants.
COMPLETE SPECIFICATION. ·
A Process for Hardening and Preserving Natural and Artificial
Stone and other like Building Material.
We, WALTER HENRY TALBOT, of Brackenhurst, Merton in the County of
Surrey, Stationer and CHARLES HARRISON VENNING, of Shortlands, in the
County of Kent, Secretary to a company, 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 :-
Our invention relates to a process for hardening natural or artificial stone,
applicable chiefly to stones of the softer kinds, so as to make them capable of
taking a polish, and for preserving stone and like building materials generally by
impregnating them with substances that prevent access of damp or other destructive
influences.
For this purpose, we first thoroughly dry the stone or other material, heating it,
We next immerse the
if necessary, to a temperature not exceeding 250° F.
material, after it is cooled, in a solution of alkaline silicate, preferably silicate of
potash, (of specific gravity about 1.3) and allow it to remain therein until it is
thoroughly impregnated with the silicate.
We then, after washing the surface, immerse the stone or material in a strong
solution (about one pound to the gallon) of alum or aluminium sulphate, and let it
renain until fully impregnated. Finally, we heat the stone or material gradually
to about 350° F. at which heat it is maintained for several hours, and then, being
allowed to cool gradually, it is fit for use.

page_text: Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, we declare that what we
claim is :-
Hardening and preserving natural and artificial stone and other like building
material by first drying the same then immersing it consecutively into an alkaline
silicate solution and a solution of alum or aluminium sulphate, and finally heating
it and allowing it to cool gradually, substantially as described.
Dated this 22nd day of March 1893.
ABEL & IMRAY,
Agents for the Applicants.