Improvements in the Preparation or Treatment of Paper for Copying Written Letters, Documents, and the like, and Chemical Prepara- tion or Compound therefor.
Year: 1886

page_text: Date of Application, 5th Nov., 1886.
Complete Left, 23rd July, 1887.
Complete Accepted, 23rd Aug., 1887.
Improvements in the Preparation or Treatment of Paper for Copying
Written Letters, Documents, and the like, and Chemical Prepara-
tion or Compound therefor.
I, WILLIAM ROGERS of Cook Street, Liverpool in the County of Lancaster, Watch
Maker, do hereby declare the nature of this invention to be as follows:-
The object of this invention is to facilitate the operation of press-copying written
letters, or documents, and improve the copies produced, so that where an inferior or
even non-copying ink has been employed, legible copies may be obtained.
It consists essentially in treating the paper upon which the copy is to be taken with
a chemical solution, which will act upon the ink so as to cause it to copy more readily
and clearly.
In carrying out the invention, I prepare the solution and prefer to damp the paper
with it preparatory to use, though the paper may in the manufacture be treated with
the chemicals, allowed to dry, and afterwards moistened with water for use. The
chemical compound, I prefer to use is a solution of ferro and ferri-cyanide of potassium
with oxalic, citric and sulphuric acid. Any other suitable chemical substance may be
used in lieu of these, or be added to them, but I think the above will be found to give
the best results.
The solution is preferably applied to the paper for the purpose of damping it as is
now the case with water.
I believe that by the use of this invention, copying ink will be rendered unnecessary,
and that either old or recent writing can be copied onto tissue paper and faded writing
can by it be brought to look like new.
Dated this 4th day of November 1886.
WM. P. THOMPSON & Co.,
of 6, Lord Street, Liverpool,
and 323, High Holborn, London,
Patent Agents for the Applicant

page_text: Improvements in the Preparation or Treatment of Paper for Copying
Written Letters, Documents, and the like, and Chemical Prepara-
tion or Compound therefor.
I, WILLIAM ROGERS of No. 11 Cook Street Liverpool Watchmaker Jeweller
Optician &c. &c. 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 :-
A chemical preparation or compound made from an acid in combination with an
alkali to dissolve dried ink without discharging the colour. Ferro-cyanide of
Potassium Vanadate of Ammonium or other substances being added to improve the
colour and durability of original and copy.
The following formula gives a good result :-
Oxalate of ammonia-or of Potash-or of Soda half an ounce. Ferrocyanide of
Potassium twelve grains Vanadate of Ammonia one grain Water one quart.
The preparation may be applied in solution to paper in the same manner and in
place of the ordinary water used for press copying of letters and used so it will take
copies of new or old writing where water alone would have no effect-or it may be
mixed with paper pulp in course of manufacture the dried paper giving similar results
on being moistened with water and pressed in contact with the writing to be copied
in the usual way.
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.
1st. The improvement in the preparation or treatment of paper for copying
documents which may have become too old and dry to be copied with water alone or
any previously known process, or may have been written with ordinary non-copying
ink the said improvement consisting in damping the paper with a solution capable
of dissolving the dried ink and forming a dark coloured compound with the same,
part of which is precipitated in the substance of the copying paper, substantially as
described.
2nd. chemical proparation or compound for use in copying written documents
or the like consisting of Oxalic or other acid in combination with Soda or other alkali
or of substances equally capable of dissolving some or all of the constituents of dried
ink without injury to the paper. And Ferro-cyanide of Potassium Vanadate of
Ammonia or other substances capable of combining with any or all of the constituents
of writing ink or any of the above named solutions of dried ink to form colouring
matter with the same substantially as and for the purpose described.
Dated this Twenty wooand dex of 11007