IMPROVE- MENTS IN THE PREPARATION OF HYDRATED OXIDE OF CHROMIUM
Year: 1865

page_text: LETTERS PATENT to Richard Archibald Brooman, of 166, Fleet Street,
in the City of London, Patent Agent, for the Invention of "IMPROVE-
MENTS IN THE PREPARATION OF HYDRATED OXIDE OF CHROMIUM."-A communi-
cation from abroad by Charles Kestner, of Thann, France.
Sealed the 19th September 1865, and dated the 21st March 1865.
PROVISIONAL SPECIFICATION left by the said Richard Archibald Brooman
at the Office of the Commissioners of Patents, with his Petition, on the
21st March 1865.
I, RICHARD ARCHIBALD BROOMAN, of 166, Fleet Street, in the City of
London, Patent Agent, do hereby declare the nature of the said Invention.
for "IMPROVEMENTS IN THE PREPARATION OF HYDRATED OXIDE OF. CHROMIUM," to
be as follows:-
This Invention is for improvements upon one for which Letters Patent were
granted to William Armand Gilbee, 28 July 1858, No. 1702, and consists.
in substituting for the bichromate of potass or the salts of chromium, ordinary
chromic hydrate, chromic oxide, or chromic acid. With the ordinary grey
hydrate dried at 212° Fahrenheit, six parts of boric acid are used to one part
of hydrate. The mixture fuses on being subjected to red heat and a chromic.
borate is obtained, this is treated with water, which decomposes it with dis-.
engagement of heat into boric acid, which remains in solution, and into.
bydrated oxide of chromium or emerald green..
The Invention then consists in the production of hydrated oxide of

page_text: chromium by means either of boric acid or other acids or salts, with an acid
reaction possessing analogous properties, or of chromic oxide, hydrate, or
acid.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said Richard Archibald Brooman in the Great Seal Patent Office
on the 21st September 1865.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, RICHARD
ARCHIBALD BROOMAN, of 166, Fleet Street, in the City of London, Patent
Agent, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Twenty-first day of March, in the year of our Lord
One thousand eight hundred and sixty-five, in the twenty-eighth year
of Her reign, did, for Herself, Her heirs and successors, give and grant
unto me, the said Richard Archibald Brooman, Her special licence that
I, the said Richard Archibald Brooman, my executors, administrators, and
assigns, or such others as I, the said Richard Archibald Brooman, my
executors, administrators, and assigns, should at any time agree with, and no
others, from time to time and at all times thereafter during the term therein
expressed, should and lawfully might make, use, exercise, and vend, within
the United Kingdom of Great Britain and Ireland, the Channel Islands,
and Isle of Man, an Invention for "IMPROVEMENTS IN THE PREPARATION OF
HYDRATED OXIDE OF CHROMIUM," (communicated to me from abroad by Charles
Kestner, of Thann, France,) upon the condition (amongst others) that I, the
said Richard Archibald Brooman, my executors or administrators, by an
instrument in writing under my, or their, or one of their hands and seals,
should particularly describe and ascertain the nature of the said Invention,
and in what manner the same was to be performed, and cause the same
to be filed in the Great Seal Patent Office within six calendar months next
and immediately after the date of the said Letters Patent.
NOW KNOW YE, that I, the said Richard Archibald Brooman, do hereby
declare the nature of the said Invention, and in what manner the same is to
be performed, to be particularly described and ascertained in and by the
following statement thereof, that is to say:-
This Invention is for improvements upon one for which Letters Patent
were granted to William Armand Gilbee, 28 July 1858, No. 1702, and
consists in substituting for the bichromate of potass or the salts of chromium,

page_text: ordinary chromic hydrate, chromic oxide, or chromic acid. With the ordinary
grey hydrate dried at 212° Fahrenheit, six parts of boracic acid are used to
one part of hydrate. The mixture fuses on being subjected to red heat and a
chromic borate is obtained, this is treated with water, which decomposes it
with disengagement of heat into boracic acid, which remain in solution, and
into hydrated oxide of chromium or emerald green.
The Invention then consists in the production of hydrated oxide of
chromium by means either of boracic acid or other acids or salts, with an
acid reaction possessing analogous properties, or of chromic oxide, hydrate, or
acid.
In witness whereof, I, the said Richard Archibald Brooman, have here-
unto set my hand and seal, this Twenty-first day of September, One
thousand eight hundred and sixty-five.
R. A. BROOMAN. (L.s.)