Improvements in the Preparation or Treatment of Paper for Copying Letters, Documents, and the like, including such as are done with a Typewriting Machine, and Improvements in Chemical Compounds or Preparations therefor.
Year: 1890

page_text: Date of Application, 2nd Aug., 1890-Accepted, 20th Sept., 1890
COMPLETE SPECIFICATION.
Improvements in the Preparation or Treatment of Paper for Copying
Letters, Documents, and the like, including such as are done
with a Typewriting Machine, and Improvements in Chemical
Compounds or Preparations therefor.
I WILLIAM ROGERS of Cook Street Liverpool and Barkfield Formby both in the
County of Lancaster, Watch Maker, 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:—
To copy typewriting of the ordinary well known kind done with the colored inks
generally in use. I use a mixture of alcohol and glycerine to which may be added
more or less of water if desired according to the effective strength required.
The following makes a strong solution:-Methylated (or other) spirit nine parts
glycerine one part. This is to be applied in the usual way for copying typewritten
letters in a press or otherwise instead of water as hitherto used. By this means
copies may be taken when the typewriting has become too old or dry to be copied
with water.
Where ordinary writing and typewriting being both on one paper are required to
be copied together at one operation or a preparation is wanted to copy either kind of
writing a fluid may be composed of the above mixed with what is now commercially
known as C
Rogers' Copying Preparation" described in my Patent Specification
No. 14274 dated Nov. 5th, 1886, with certain modifications, improvements and
additions to be hereby particularly described and ascertained namely:
A solution in water of a neutral oxalate-such as oxalate of potash-or of soda-
or of ammonia-or mixtures of any or all these three the essential matter being that
the solution shall be neutral or nearly so.
To improve the color and durability of originals and copies :-
:-
Additions may be made of one or more of the following substances though all
must not be put in together because of their well known reactions:-
Sulphide of ammonia-or of potassium. Vanadate of ammonia. Chromate or
bichromate of potassium. Ferri-cyanide or ferro-cyanide of potassium. Gallic-
pyro-gallic or tannic acids and some salts of iron.
Most of these materials adunit of being incorporated along with the oxalates in
paper during or after manufacture, or packed for sale in the dry state.
The following makes a strong solution to be applied in the usual way for
copying letters in a press or otherwise instead of water as hitherto used namely
One ounce to one ounce and a half of neutral oxalate to a quart of water. Half
the quantity of oxalate being effective with many inks or recent writing.
To a quart of this may be added small quantities of such of the above named addi-
tions for improving color and durability as may be desired-having regard to the
variety of composition of the inks now made, and considering that the same substances
will not affect all inks alike-namely for instance.
If ferro cyanide of potassium be used about twelve grains will be enough or from
one to twenty grains of vanadate of ammonium may be added-and-or-similar.
quantities of the others.
The sulphides have an objectionable smell which practically prevents their use in
the commercial article made for office use.
Other neutralised acids could be used for copying but none do as well as the
oxalates referred to.
No additions for improving the color of typewriting are needed and its durability
will not be affected by either of these preparations.
17 .

page_text: Having recapitulated the Specification of Nov. 5th, 1886-and now hereby added
such modifications and improvements as have resulted from further research. I
revert to:
The copying of ordinary writing and typewriting-both; together-and at one
operation and :-
A preparation which will do it :-
Which may be made as follows:-
About two-thirds of "Rogers' Copying Preparation "-of the full strength given-
with or without any of the additions described--and about one-third of the glycerine
and spirit solution of the full strength described.
It is not advisable to dilute this mixture with water, though the proportions may
be varied so as to give an equable action on the two kinds of ink.
Each separate preparation acts on the ink for which it is intended and is indifferent
to the other ink, and as the composition of ink varies it is impracticable to prescribe
definite proportions which shall be equally effective with.all.
The last described mixture is not clear and the bottle should be shaken before use.
Any copying paper as hitherto made may be used.
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.
First The improvement in the proportions of and additions to the chemical
compound or preparation for copying letters new or old-written with almost any
ink described in my Specification No. 14274 of Nov. 5th, 1886.
Second-The chemical preparation for copying typewriting new or old.
Third The combination of the two preparations for copying ordinary writing new
or old-done with almost any ink-and for copying typewriting new or old done
with the usual colored inks-both together-at one operation substantially as-and
for the purpose-described.
Dated this 30th day of July 1890.
J. E. EVANS-JACKSON,
Agent for Applicant.