Improvements in or connected with Rolled Gold Plate.
Year: 1897

page_text: TIVOVIDIUL DITUITIVATION.
Improvements in or connected with Rolled Gold Plate.
I, AUGUSTE DESIRE PENNELLIER, of No. 56, Gray's Inn Road, in the County of
London, Gold and Silver Refiner, do hereby declare the nature of this invention
to be as follows:-
This invention relates to improvements in or connected with rolled gold plate.
Gold plate, according to the method of manufacture at present adopted, consists
of a base plate of copper, copper alloy or the like covered with gold leaf of a
suitable thickness, which is pressed thereon by heavy hydraulic pressure.
The covering of gold thus obtained, and which is extremely thin, more or less
suffers during the manufacture of the gold plate into an article of jewellery or
the like, and the object of the present invention is to protect the gold surface
against injury during such operation.
In carrying the invention into effect, a base plate of copper, copper alloy
or the like is employed, upon which is laid a suitable thickness of gold leaf, and
over the gold leaf is placed an extremely thin sheet or film of a suitable metal,
such for example as copper or brass, and which is of such a nature as to be capable
of easy removal from the gold, after the manufacturing operation is completed.
This protecting coating of copper or brass or the like is more or less removed
during the working up of the metal into an article of jewellery, but the removal
thereof may be completed either by burnishing it, or it may be dissolved by the
aid of acid without injuriously affecting the gold.
By the means hereinbefore described, the gold plate will be efficiently protected
against injury by heat, abrasion, or otherwise during the soldering working or
handling of the metal and a considerable saving will thus be effected in gold,
whilst the appearance of the finished article will be improved.
.
1007
VAUGHAN & SON,
Agents for the Applicant.

page_text: and in what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement:-
My said invention relates to improvements in or connected with rolled gold
plate.
Rolled gold plate, according to the method of manufacture at present adopted,
consists of a base plate of copper, copper alloy or the like covered with gold leaf
of a suitable thickness which is pressed thereon by heavy pressure while the metals
are in a heated state, as is well known.
The covering of gold, thus obtained, which is comparatively thin, more or less
suffers during the manufacture of the gold plate into an article of jewellery or
the like, and the object of the present invention is to protect the gold surface
against injury during the process of such manufacture.
In carrying the present invention into effect, a base plate of copper, copper
alloy or the like is employed, upon which is laid a suitable thickness of gold leaf,
and over the gold leaf is placed a sheet or film of copper, brass or other suitable
metal of such a nature as to be capable of being easily removed from the gold
after the manufacturing operation has been completed, the base plate, gold leaf
and sheet of copper, brass or other metal are then heated to redness and sub-
mitted to a heavy pressure in the manner ordinarily employed in the manufacture
of gold plate.
The removal of the coating of copper, brass or the like from the manufactured
article may be effected without injuriously affecting the gold surface by dissolving
such coating by means of a suitable acid.
By the means hereinbefore described, the rolled gold plate will be efficiently
protected against injury by heat, abrasion or otherwise during the soldering,
working or handling of the metal and a considerable saving in gold will thus be
effected, whilst the appearance of the finished article will be improved and the
quality of the gold preserved.
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 rolled gold plate, placing a sheet or film of copper, brass
or other suitable metal over the upper surface of the gold leaf and heating and
pressing together the base plate, gold leaf and copper or the like, substantially
as and for the purpose herein before described.