A NEW OR IMPROVED POWDER FOR HARDENING METALS
Year: 1886

page_text: Date of Application, 15th Mar., 1886.
Complete Left, 14th Dec., 1886.
Complete Accepted, 28th Jan., 1887.
LORENTZ ALBERT GROTH K.G.V. Civil Engineer and Proprietor of the Patent
Industrial and Financial Agency 30 Finsbury Pavement London E.C. do hereby
declare the nature of said invention for "A NEW OR IMPROVED POWDER FOR HARDENING
METALS "to be as follows:-
The object of this invention is to harden metals by means of a special prepared
powder.
This powder is prepared in the following manner :-Cochineal insects (Coccus
polonicus) are (when the dye or colouring matter is extracted by means of boiling
water) mixed in quantities of 100 kilos with 2124 kilos phosphoric acid and 32+ kilos
nitrogen in organic substance, in a vessel and vapourized, when the mass is brought
into a drying room till dry enough to be powdered, when 50 kilos of soot are mixed
with it.
The metal is hardened by means of this powder in the following manner:
The metal (sheet iron) to be hardened is placed in an iron box and enclosed in more
or less of the powder according to the thickness of the sheet. When the box is filled
it is hermetically closed by means of clay and placed in the heating furnace, and left
for a longer or shorter time according to the thickness of the plates.
LORENTZ ALBERT GROTH.

page_text: COMPLETE SPECIFICATION.
A New or Improved Powder for Hardening Metals.
I LORENTZ ALBERT GROTH, K.G.V. Civil Engineer and Proprietor of the Patent
Industrial and Financial Agency 30 Finsbury Pavement, London E.C. do hereby
declare the nature of my said invention for "A NEW OR IMPROVED POWDER FOR
HARDENING METALS," a communication to me from abroad by C. Beckstein, Managing
Director of Reutlingen in the German Empire and in what manner the same is to be
performed to be particularly described and ascertained in and by the following
statement:-
The object of this invention is to harden metals by means of a special prepared
powder.
This powder is prepared in the following manner: Insects, known as Cochineal
("coccus polonicus) are, by means of boiling water, released from the colour or
dyeing materials contained in them, whereafter 100 kilos of such prepared cochineal
are mixed in a vessel with 2124 kilos phosphoric acid and 324 kilos nitrogen in
organic substance, and evaporated after which the mass is brought into a drying
room till dry enough to be powdered, when 50 kilos of soot are mixed therewith.
The metal is hardened by means of this powder in the following manner:
The metal (sheet iron) to be hardened is placed in iron box and enclosed in more or
less of the powder, according to the thickness of the sheet. When the box is filled,.
it is hermetically closed by means of clay and placed in the heating furnace and left
for a longer or shorter time, according to the thickness of the plates.
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:
The preparation of a new or improved powder for hardening metals by mixing
100 kilos of special prepared Cochineal in a vessel with 212 kilos phosphoric acid
and 32 kilos nitrogen in organic substance, and thereafter vapourized, dryed and
powdered, substantially as hereinbefore described.
LUKENIZ ALBERT GRUTH.