An Improved Manufacture of Gold Foil for Use in Dentistry.
Year: 1895

page_text: Date of Application, 18th Feb., 1895-Accepted, 6th Apr., 1895
COMPLETE SPECIFICATION
An Improved Manufacture of Gold Foil for Use in Dentistry.
I, EMILE DE TREY, of 1, Allschwylerstrasse, Bâle, Switzerland, Dentist, 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:-
Hitherto gold used in dentistry has been in the form of beaten foil or in a matt
or dead form (crystalline or spongy).
Beaten gold has the disadvantages of being not sufficiently malleable whilst matt
or dead gold is too friable and causes great loss of material.
The present invention consists of a new kind of gold foil adapted for use in
dentistry and possessing neither of the above mentioned disadvantages, that is to
say, being extremely malleable but at the same time not friable.
According to my invention I form gold foil by covering one or both faces of a
thin beaten sheet of gold with a layer of dead or matt gold caused to adhere to the
gold sheet by any suitable means.
The matt gold can be caused to adhere to the gold sheet by providing as a support
for the matt or dead gold a perforated and rough sheet of beaten gold, that is to
say, a perforated sheet provided with projections around the perforations of the
gold sheet or by heating the gold sheet, covered with the layer of matt gold, to a
suitable temperature for example 360° C. or the layer may be caused to adhere to
the sheet by these two methods combined.
In the accompanying drawing,
Figures 1 and 2 shew by way of example a plan and a section respectively of a
sheet of gold foil made according to my invention; whilst,
Figures 3 and 4 shew in plan and sectional elevation respectively the perforated
rough gold sheet adapted for causing the dead or matt gold to adhere to both of
its roughened faces.
As shewn in the figures the gold sheet A is provided with a series of
perforations a, a around which the metal of the sheet has been raised so that
projections or burrs b, b are formed around the said perforations a, a on the two
faces of the beaten sheet alternately thus causing both sides of the said sheet to be
roughened.
This gold sheet A is covered on both sides with a layer B of dead or matt gold
applied in such a manner that the projections or burrs b, b, of the gold sheet A
penetrate the layer of matt gold and cause it to adhere to the sheet A.
This adherence may be rendered still more effective by heating the gold sheet A
provided with burrs b, b and covered with the layers B, B, to a suitable temperature,
for example 360° C.
The dead or matt gold may be caused to adhere sufficiently to the gold sheet by
simply heating to the hereinbefore mentioned temperature a gold sheet smooth and
not perforated and having one or both of its faces covered with a layer of matt
gold as shewn in Figure 5 in which A' is the gold sheet and B' the layer of matt
gold caused to 'adhere to the gold sheet A' by being thus heated.
It is obvious that the gold sheet A may be provided with projections or
burrs b, b, on one face only which could then be covered or not with matt gold on
both sides according as the sheet is subjected or not to the hereinbefore described
heating operation.
In some cases instead of using a sheet of gold I employ a sheet of beaten tin as a
support for the matt gold which tin may be provided or not with burrs or

page_text: projections b, b on both faces and covered on both faces with a layer of matt
gold.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1. A.new kind of:gold foil for use in dentistry consisting essentially of a sheet of
beaten metal covered with matt gold substantially as described.
2. Gold foil for use in dentistry consisting essentially of a sheet of beaten gold
covered with matt gold forming an adherent layer either on one or both faces of
the beaten gold sheet substantially as described.
3. Gold foil for use in dentistry composed of a perforated sheet of beaten gold
having one side roughened and covered with a layer of matt gold caused to adhere
thereto by the burrs or projections formed around the perforations of the sheet of
beaten gold substantially as described.
4. Gold foil for use in dentistry composed of a sheet of beaten gold having one
of its faces provided with a layer of matt gold caused to adhere thereto by being
heated to a suitable temperature as set forth.
5. Gold foil for use in dentistry composed of a perforated sheet of beaten gold
having both its faces roughened and both faces covered with a layer of matt or
dead gold rendered adherent thereto by the projections or burrs formed around the
perforations of the sheet of beaten gold the dead gold being if desired rendered still
further adherent to the gold sheet by being heated to a suitable temperature
substantially as described.
6. Gold foil for use in dentistry consisting of a perforated sheet of beaten gold
having one or both faces roughened and both faces covered with a layer of dead or
matt gold rendered adherent to one of the faces by the projections or burrs formed
around the perforations of the gold sheet and caused to adhere to the other face
by being heated to a suitable temperature substantially as described.
7. Gold foil for use in dentistry consisting of a sheet of beaten gold having both
sides covered with a layer of matt gold caused to adhere thereto by being heated
to a suitable temperature as described.
8. Gold foil for use in dentistry consisting of a sheet of beaten tin having both
faces covered with a layer of dead or matt gold substantially as described.
Dated the 18th day of February 1895.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.