Improvements relating to the Enamelling of Articles of Copper.
Year: 1889

page_text: Date of Application, 27th July, 1889
Complete Specification Left, 18th Apr., 1890-Accepted, 24th May, 1890
PROVISIONAL SPECIFICATION.
[Communicated from abroad by ALEXANDRE GLIBERT, of Laeken, near Brussels, in
the Kingdom of Belgium, Manufacturer.]
Improvements relating to the Enamelling of Articles of Copper.
I, HENRY HARRIS LAKE, of the firm of Haseltine, Lake & Co. Patent Agents,
Southampton Buildings, in the County of Middlesex do hereby declare the nature of
this invention to be as follows:-
This invention relates to the enamelling of articles of copper, more especially
kitchen utensils made of such material.
The processes heretofore employed of enamelling articles of copper, more especially
utensils serving for the preparation of food have not given altogether satisfactory
results, and have been little used in practice, either by reason of the high price of
the processes employed, owing to the necessity of coating the articles with several
layers of enamel, or the cost of these enamels, or the small resistance of the latter.
Of all the industrial questions those bearing upon alimentation are undoubtedly the
most important.
Alimentary substances and beverages are however not alone concerned. The
utensils in which they are prepared present dangers to health, which, being less
apparent, are perhaps more formidable by reason of the false safety which they
inspire.
Pottery has in recent times undergone many transformations, and despite these
numerous changes effected in the utensils made of glazed earthenware, bronze, cast-
metal, copper, sheet iron, or the like, kitchen utensils of tinned copper usually pass
for the best and continue to be regarded as ornaments in houses.
These utensils do not present less danger on account of being tinned because the
copper may be laid bare and cause the formation of acetate of copper through the
least forgetfulness, for example by allowing a small flame to act upon it, or by the
action of sour aliments which have been left to cool in a saucepan.
As it is not possible to discard the habit of using culinary utensils of copper, I
have attempted to devise a simple and inexpensive process which is designed to
obviate the numerous inconveniences hereinbefore referred to.
According to the aforesaid invention utensils and other articles of copper are
preserved by enamelling them internally, which process consists in the direct
application of enamel to the said articles, without the interposition of any of the
material hitherto used in such cases.
This enamel does not contain any deleterious substances, being composed of four
parts of felspar, three parts of flint, five parts of borax and two parts of cryolite.
D
371
1
T
1000
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements relating to the Enamelling of Articles of Copper.
I, HENRY HARRIS LAKE, of the firm of Haseltine, Lake & Co., Patent Agents,
Southampton Buildings, in the County of Middlesex 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 :-
This invention relates to the enamelling of articles of copper, more especially
kitchen utensils made of such material.

page_text: The processes heretofore employed of enamelling articles of copper, more especially
utensils serving for the preparation of food have not given altogether satisfactory
results, and have been little used in practice, either by reason of the high price of
the processes employed, in consequence of the necessity of coating the articles with
several layers of enamel, or the cost of these enamels, or the small resistance of the
latter.
Of all the industrial questions those bearing upon alimentation are undoubtedly the
most important.
Alimentary substances and beverages are however not alone concerned. The
utensils in which they are prepared present dangers to health, which being less
apparent, are perhaps more formidable by the reason of the false security which they
inspire.
Pottery has in recent times undergone many transformations, and despite these
numerous changes effected in the utensils made of glazed earthenware, bronze, cast-
metal, copper, sheet-iron, or the like, kitchen utensils of tinned copper which usually
pass for the best and continue to be used not only for cooking purposes but in some
cases for ornaments in the kitchen.
These utensils do not present less danger on account of being tinned because the
copper may be laid bare and cause the formation of acetate of copper through the
least forgetfulness for example by allowing a small flame to act upon it or by
the action of sour aliments which have been left to cool in a saucepan.
As it is not possible to discard the use of culinary utensils of copper I have
endeavoured to devise a simple and inexpensive process which will obviate the
numerous inconveniences hereinbefore referred to.
According to the aforesaid invention utensils and other articles of copper are
preserved by enamelling them internally, which process consists in the direct
application of enamel to the said articles without the interposition of any of the
material hitherto used for preventing oxidation.
This enamel does not contain any deleterious substances being composed of four
parts of feldspar, three parts of flint, five parts of borax and two parts of cryolite.
Having now particularly described and ascertained the nature of the said invention,
and in what manner the same is to be performed as communicated to me by my
foreign Correspondent I declare that what I claim is :-
First. The preservation of copper utensils by onamelling them interiorly which
consists in the direct application of the enamel to the copper without the interposition
of any of the materials hitherto used for preventing oxidation.
Second. The improved enamel composed of four parts of feldspar, three parts of
flint, five parts of borax and two parts of cryolite.
Dated this 18th day of April 1890
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, Agents for the Applicant.