IMPROVEMENTS IN THE MANUFACTURE OF FILTER PLATES
Year: 1879

page_text: LETTERS PATENT to Henry Edward Newton, of the Office for Patents, 66,
Chancery Lane, in the County of Middlesex, Civil Engineer, for the Invention
of "IMPROVEMENTS IN THE MANUFACTURE OF FILTER PLATES." A. com-
munication froin abroad by Albert Louis George Dehne, of Halle on the Saal,
in the Empire of Germany.
Sealed the 10th October 1879, and dated the 5th May 1879.
PROVISIONAL SPECIFICATION left by the said Henry Edward Newton at
the Office of the Commissioners of Patents on the 5th May 1879.
HENRY EDWARD NEWTON, of the Office for Patents, 66, Chancery Lane, in the
County of Middlesex, Civil Engineer. " IMPROVEMENTS IN THE MANUFACTURE
OF FILTER PLATES." [A communication from abroad by Albert Louis George
Dehne, of Halle on the Saal, in the Empire of Germany.]
This Invention relates to the manufacture of plates to be used as the filtering
medium in filter presses and other filtering apparatus, and consists in forming such
plates of metal in combination with some suitable material which will not fuse or
burn on contact with the molten metal.
In order to prepare a thin filtering plate the non fusible material is packed in a
mould and the molten metal is run into the mould under pressure so as to fill up
the interstices in the packed material.
In order to prevent air bubbles it is found desirable that the molten metal should
be forced into the mould from below.
Among the metals which may be used for the above purpose may be cited tin,
zinc, lead, and iron, and such substances as ashes, coke, slag, charcoal, gravel, and
stone may be employed as the non-fusible materials.
The plates may be used in the rough state as taken from the mould, or their
surfaces may be smoothed in any suitable manner before use.
The compound filter plates thus formed will when applied to a filter press be placed
between two slime chambers, or between the slime chambers and the adjoining
press plates, and will assist in forming tight joints for the slime chambers.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Henry Edward Newton in the Great Seal Patent Office on the
5th November 1879.
HENRY EDWARD NEWTON, of the Office for Patents, 60, Chancery Lane, in the
County of Middlesex, Civil Engineer. "IMPROVEMENTS IN THE MANUFACTURE
OF FILTER PLATES." A communication from abroad by Albert Louis George
Dehne, of Halle on the Saal, in the Empire of Germany.
This Invention relates to the manufacture and application of a new filter medium
for filter presses and other filtering apparatus.
For the manufacture of this filter medium molten metal is employed as a binding
material for some disintegrated filtering substance which will not form a fusion with
the metal when the latter is in a liquid state.
Among the metals available for this purpose may be mentioned, tin, zinc, lead,
and iron.
As suitable filtering substances to be used in combination with the molten metal
the following may be mentioned, viz., ashes, coke, slag, charcoal, gravel, and stone,
but other materials are not excluded which do not form a fusion with the metal
when in a molten state.
In manufacturing the filter plate a suitable mould for casting thin plates is
provided. This mould being filled with one of the materials above mentioned, that
is, either ashes, coke, slag, charcoal, gravel, or stone, molten metal is run into the
mould under pressure so as to fill up the spaces between the fragments of filtering
material.
In order to avoid air bubbles the metal is admitted into the mould from below
and under a head or pressure.
In this manner plates are obtained which may be used as filter mediums either in
the rough state or after being smoothed by planing or grinding.
This filter medium may be employed as a means for tightening the press or slime
chamber in filter presses by placing the composition filter plates at the sides of the
slime frames, also between the latter and the adjoining press plates, or between two
alime frames, so that in screwing up the filter press the composition filter plates will
tighten up the slime chamber.
Having now set forth the nature of the Invention of "Improvements in the
Manufacture of Filter Plates," as communicated to me from abroad, and explained
the manner of carrying the same into effect, I wish it to be understood that under
the above in part recited Letters Patent I claim,―
The manufacture and use of filter plates composed of fragments of filtering
material combined together by molten metal in the manner above described.
In witness whereof, I, the said Henry Edward Newton, have hereunto set
my hand and seal, the Fifth day of November, in the year of our Lord
One thousand eight hundred and seventy nine.