Improvements in the Method of Producing Infusions of Tea and similar Solutions Free from Tannin.
Year: 1890

page_text: Date of Application, 20th Jan., 1890
Complete Specification Left, 20th Oct., 1890-Accepted, 22nd Nov., 1890
PROVISIONAL SPECIFICATION.
Improvements in the Method of Producing Infusions of Tea and
similar Solutions Free from Tannin.
I, HARRY GRIMSHAW, of the Canal Chemical Works Clayton Manchester in the
County of Lancaster, Chemical Manufacturer, do hereby declare the nature of this
invention to be as follows:-
This invention relates to the means for and method of producing or treating
infusions and solutions from tea and other materials containing tannin, in such a
manner that the resulting infusion or solution shall be practically free from tannin.
According to these improvements I take up the tannin from the infusion or
solution by means of animal substances such as horn shavings, dried albumen, hide
chips, skin clippings, gelatine, and the like. These substances or such of them as
may be preferred, is or are added to the tea or other material from which the infusion
or solution is to be made, or they may be added to the infusion or solution as may
be most convenient or desirable.
Alternatively, the infusion or solution may be passed through a diaphragın, sheet,
or mass of such animal substance or substances.
Dated this 18th day of January A.D. 1890.
WILLIAM E. HEYS,
Agent for the Applicant.
COMPLETE SPECIFICATION.
Improvements in the Method of Producing Infusions of Tea and
similar Solutions Free from Tannin.
I, HARRY GRIMSHAW of the Canal Chemical Works Clayton Manchester in the
County of Lancaster, Chemical Manufacturer, 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 :-
This invention relates to the means for and the method of producing or treating
infusions and solutions of tea and of other similar materials containing tannin, in
such a manner that the resulting infusion shall be particularly free from the tannin.
According to these improvements I separate or remove the tannin from the solution
or infusion, or prevent it from coming into solution with the bulk of the fluid, by
means of suitable animal substances such as horn shavings, dried albumen, hide
chips, skin parings and clippings, and the like.
These substances or one or more of them as may be preferred, is or are added to
the dry tea leaves before infusion, or to the other tannin containing material of which
the solution or infusion is to be made, or it or they is or are added to the infusion or
solution, as may be preferred. For various reasons however, I prefer to add the
animal substance or substances to the tannin containing material before the infusion
or solution therefrom is prepared.
Alternatively, the infusion or solution may be passed or filtered through a layer or
mass of the animal material in a more or less divided condition, so that the liquid
may come into contact with as large a quantity as practicable of the animal materials.
The quantity of the animal substances which should be added to the tannin
containing material for the purpose of this invention must in each case be deter-
mined by the amount of tannin contained therein. In the case of tea for example
the proportion may vary from one part of the animal substance to ten parts of the
finer high class teas, to two parts of the animal substances to ten parts of the

page_text: rougher lower grade teas and corresponding proportions may be employed with
other tannin containing materials.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is-
1. The hereinbefore described method of producing infusions and solutions of tea
and other similar materials free from tannin, substantially as set forth.
2. The addition to dry tea and other similar materials from which infusions and
solutions have to be made, of suitable animal materials such as horn, albumen, skin
and hide, substantially as and for the purpose hereinbefore described.
3. Separating and removing tannin from infusions and solutions of tea and other
similar materials, by means of suitable animal matters such as born, hide, skin and
albumen, in a divided state, substantially as herein before described.
Dated this 17th day of October A.D. 1890.
WILLIAM E. HEYS,
Agent for the Applicant.