on Glass or other Round or Flat Substances for Decorating and Advertizing Purposes.
Year: 1886

page_text: Date of Application, 3rd May, 1886.
Complete Left, 1st Feb., 1887.
Complete Accepted, 1st Apr., 1887.
on Glass or other Round or Flat Substances for Decorating and
Advertizing Purposes.
I FREDERICK WINTERHOFF of 6 Eyot Gardens Hammersmith in the County of
Middlesex Lithographer and Glass Engraver do hereby declare the nature of this
invention to be as follows :-
A new and improved process for producing Ornaments and lettering on glass or
other round or flat substances for decorating and advertizing purposes.
This invention has for its object the improved means for producing Ornaments on
Glass and other substances and to etch these Ornaments out with fluoric or any other
acid or silver the same.
I clean the article well and coat the same with a solution of Asphalt Bichromate
black or any other coloring substance and let this dry in a dark room I then draw or
engrave my Ornament on stone Zine Steel or any substance from which I can make
a Printing plate Letterpress or wood block India rubber
stamps &c.
I now can print either direct on the coated Asphalt or I print on paper which I
prepare with starch or other suitable substance and print with any color on this paper
and put this print on the coated side of the article I intend to ornament with pressure
and take the paper off it will be seen that I have only taken off half the ink from the
paper I then dust thus transfer as I should call the Ornament now on the top of
the coated glass a negative over with bronze powder or any other powder or gold leaf
so as to prevent the light coming through it and put the same in the sun or a strong
light for about 14 hours and wash the Ornament out with any Oil which will evaporate
and when I have the Print or negative properly washed out I wash it with clean

page_text: water and acid it with fluoric or any other acid and it will be seen that putting my
print direct on the surface of the coating that I can make thousands from one print
ready and put them at one time in the light against the old method of using glass
negatives so I am able to produce in two hours hundred fold as with glass negatives
then having put my print properly on the coated glass it is impossible to shift as this
is very often the case with glass negatives and the work often is doubled and useless
I am able to produce by my process the finest artistic work as well as any common
lettering and there is only a few little spots to touch up after washing out and this
process does not require skilled Workmen.
Dated this 3rd day of Nov 1886

page_text: A New and Improved Process for Producing Ornaments and Lettering
on Glass or other Round or Flat Substances for Decorating and
Advertizing Purposes.
I, FREDERICK WINTERHOFF of 18 Dellview Road in the parish of Tottenham, late
of 6 Eyot Gardons, Hammersmith, in the County of Middlesex, Lithographer and
Glass Engraver 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 :—
Heretofore glass and other surfaces have in some cases been etched by first covering
the surface with a protecting coating then removing parts from the protecting coating
where the glass or other surface is to be etched or eaten away and then etching out
the exposed surface with fluoric or other acid.
Glass and other surfaces have also been coated with a solution of a substance such
as asphalte which is rendered insoluble when acted on by light. A photographic
negative has been placed over the coated surface and exposed to light-part of the
coating has so been rendered insoluble the remainder has been dissolved away and
the parts of the glass or other surface so left exposed have been etched or eaten away
with fluoric or other acid. These processes are slow and costly.
By my invention I am able to greatly increase the rate at which etched work can
be produced.
For engraving or etching upon glass or upon brass, copper, zinc or other metal
plates or upon marble granite or other substance which can be eaten away by acid 1
first clean the substance or article to be etched and coat the same with a solution of
asphalte, bichromate black or any other substance affected or hardened by exposure to
sun light and which is impervious to acids and allow the same to dry in the dark.
Preferably I use a solution made by dissolving about 4 lbs. of finely powdered
asphalte in 3 pints of spirit of Turpentine boiling it gently for about 3 hours and then
adding and well, stirring in half a pint of spirits of turpentine. Afterwards the
solution should be filtered through muslin while hot and should be kept in stoppered
bottles away from the light.
I also draw or engrave the matter to be etched on a lithographic stone or on a zinc
or steel plate or otherwise form a printing plate, block or stamp with which copies of
the design or pattern to be etched can be printed.
1 then print with printing ink from the stone or plate or block on to lithographic
transfer paper as many impressions as are required of the matter to be etched. I then
transfer the printed matter from the transfer paper on to the coating on the article.
I then dust or cover the transferred matter over with bronze powder, gold or other
metal leaf or any finely ground powder which will obstruct the passage of light and
then carefully wash it when it will be found that the bronze powder or whatever else
is used has adhered only to the printed matter and forms above it a surface impervious
to light.

page_text: I then place the article with the coated side towards the sun light the result being
that the exposed surface of the asphaltum coating is hardened but the portion covered
by the bronze powder being protected from the action of the light remains soft.
I then with a stiff brush and paraffin oil brush out the soft portion which is the
printed matter required to be etched and it is then ready for aciding in the usual way
the remaining hard portion of the coating being removed afterwards by a soda bath
or by turpentine or in other ordinary ways.
If the design or pattern to be engraved is of a broad distinct nature a fairly good
result can be obtained even when the transferred print or design is not afterwards
coated with the bronze or other powder but in all cases I prefer to use the bronze or
other powder as far better results are obtained by its use.
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. The transferring of a printed design or pattern on to the coated surface from
transfer paper and subsequently after exposing the surface to light and dissolving out
such parts of the coating as are not thereby rendered insoluble etching out the exposed
portions of the surface by means of acid.
2. The transferring of a printed design or pattern on to the coated surface from
transfer paper and then dusting over or covering this transferred design with metal
leaf or with bronze powder or other finely ground powder which will obstruct the
passage of light and subsequently after exposing the surface to light and dissolving
out such parts of the coating as are not thereby rendered insoluble etching out the
exposed portions of the surface by means of acid.
Dated this 6th day of January 1887.