Improvements in the Manufacture of Paint.
Year: 1893

page_text: Date of Application, 8th May, 1893
Complete Specification Left, 8th Feb., 1894-Accepted, 5th May, 1894
PROVISIONAL SPECIFICATION.
Improvements in the Manufacture of Paint.
I, WILLIAM Herbert Hyatt, of 24 Cottage Grove, Landor Road, Stockwell
in the County of Surrey, Fellow of the Chemical Society of Great Britain,
Chemical Engineer, Consulting Chemist and Metallurgist, do hereby declare the
nature of this invention to be as follows:-
My invention consists in the addition of borax (or any salt of boron that will
form a borate with a metal) to sulphate of lead and oil or other medium either by
first adding the salt to the sulphate of lead, and then adding the oil or other
medium or by mixing the salt with the oil or other medium and then adding the
mixture to the sulphate of lead.
Any sulphate of lead may be used, but I prefer such as has been precipitated
from acetate of lead solutions.
The disadvantage of sulphate of lead used alone as a pigment, has up to the
present been its lack of opacity (or body) and by its not readily combining with
the oil or other medium nor drying quickly, but all these disadvantages are
overcome by my invention.
By the addition of borax or salt of boron to the sulphate of lead and oil or other
medium a pigment is produced of great density, opacity and covering power, having
all the advantages of carbonate of lead paint (white lead) but possessing in addition
the extra advantages that sulphate of lead and borax are neither of them poisons, nor
are they in any way harmful either in manufacture or use, that it does not have
the sickly smell of white lead and its colour is not changed by sulphuretted
hydrogen.
I find to 1 per cent. of borax, a suitable addition to the sulphate of lead
and oil.
CARPMAEL & Co.,
Agents.
COMPLETE SPECIFICATION.
Improvements in the Manufacture of Paint.
I, WILLIAM HERBERT HYATT, of 24 Cottage Grove, Landor Road, Stockwell,
in the County of Surrey, Fellow of the Chemical Society of Great Britain,
Chemical Engineer, Consulting Chemist and Metallurgist, 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 :-
My invention consists in the addition of borax (or any salt of boron that will
form a borate with a metal) to sulphate of lead and oil or other medium either by
first adding the salt to the sulphate of lead, and then adding the oil or other
medium or by mixing the salt with the oil or other medium and then adding the
mixture to the sulphate of lead.
Any sulphate of lead may be used, but I prefer such as has been precipitated
from acetate of lead solutions.
The disadvantage of sulphate of lead used alone as a pigment has up to the
present been its lack of opacity (or body) and by its not readily combining with
the oil or other medium nor drying quickly, but all these disadvantages are
overcome by my invention.

page_text: By the addition of borax or salt of boron to the sulphate of lead and oil or other
medium a pigment is produced of great density, opacity and covering power,
having all the advantages of carbonate of lead paint (white lead) but possessing in
addition the extra advantages that sulphate of lead and borax are neither of them
poisons, nor are they in any way harmful either in manufacture or use, that it does
not have the sickly smell of white lead and its colour is not changed by sulphuretted
hydrogen.
I find to 1 per cent. of borax preferably the latter a suitable addition to the
sulphate of lead and oil.
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 :-
In the manufacture of paint the combination of borax or a salt of boron with
sulphate of lead substantially as described.
Dated this 8th day of February 1894.
WILLIAM HERBERT HYATT.