An Improved Process of Filtering Oil.
Year: 1890

page_text: Date of Application, 25th Mar., 1890
Complete Specification Left, 22nd Aug., 1890-Accepted, 4th Oct., 1890
PROVISIONAL SPECIFICATION.
An Improved Process of Filtering Oil.
I, CHARLES BAKER, and WALTER ELIPHALET CRANE, both of 421, 13th Ave. S.E.
Minneapolis, Minnesota, U.S.A., Gentlemen, do hereby declare the nature of this
invention to be as follows:-
This invention has reference to an improved process of filtering oil, and in the
carrying out of which process I provide a suitable casing or vessel, in which is placed a
liquid with which the oil to be filtered will not mix, and which is of greater specific
gravity than the oil, so that the oil will rise through it to the top of the liquid.
Submerged in this liquid are one or more filtering mediums through which the oil
must pass as it rises to the top of the liquid. These mediums are entirely submerged
in the liquid, and the oil passes through them simultaneously with its passing through
the liquid, so that the oil is being acted upon by the liquid all of the time that it is
passing through the filtering medium. The action of the liquid upon the oil, causes it
to become thin, and as the liquid extends above the filtering mediums, the oil will
remain thin until after it has passed through all of the filtering mediums. This thinning
of the oil by the action of the liquid upon it has two important results:
First, the specific gravity of the oil becomes less, and its drop or globular form is
broken up, and in passing through the filtering material all foreign substances will bo
arrested and held by the filtering material. Substances which were held in suspension
by the thick oil will now be readily separated from it.
Second, the thin oil will more readily and evenly pass through the filtering mediums,
and as it does not pass out of the liquid until after it has passed through these
mediums it must consequently remain thin until it has passed through the filters.
In other words, it passes through the filters while being simultaneously acted upon by
the liquid.
In combination with the casing or vessel hereinbefore referred to, is provided a
pipe, through which the oil is conducted beneath the filters and another pipe is pro-
vided by which the purified oil may be withdrawn.
gum
As the filtering mediums are entirely submerged in the liquid, the tendency to
or clog up the filtering material by the oil is removed. Filter cloths or any filtering
inaterial that is exposed to the atmosphere and is used for filtering oil will soon become
so gummy that the oil will not pass through it, and even where the filtering mediums
are submerged in the oil they will soon become clogged up, and even where it is in-
tended that the filtering mediums shall remain covered with oil they will often become
exposed to the atmosphere, owing to the supply of oil running short. With my
process however, as the filtering material is always fully submerged in the liquid, it is
kept entirely free from this difficulty.
When the filtering medium becomes clogged with the dirt or sediment removed
fron the oil, it may be readily removed and changed; but it will not become gummy
from the passage of the oil through it, and will only need to be renewed when it
has become filled up by the dirt removed from the oil.
Dated this 25th day of March 1890.
J. P. BAYLY,
Agent for the Applicant.

page_text: COMPLETE SPECIFICATION.
An Improved Process of Filtering Oil.
I, WALTER ELIPHALET CRANE, and CHARLES BAKER, both of 421, 13th Ave. S.E.,
Minneapolis, Minnesota, U.S.A., Gentlemen, do hereby declare the nature of this inven-
tion 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 improvements in the process of filtering oil, and is
especially adapted for cleaning waste oil that has been used for lubricating purposes
and has been caught as it escaped from the journal or other bearings.
The invention consists, generally, in the process hereinafter described, and pointed
out in the claim.
In the accompanying drawings,
Figure 1 is a side elevation of an apparatus that is adapted for carrying out our
improved process.
Fig. 2 is a central vertical section of the same.
Fig. 3 is a similar section taken on a plane at right angles to Fig. 2.
We provide a suitable casing or vessel, in which is placed a liquid with which the
oil to be filtered will not mix, and which is of greater specific gravity than the oil, so
that the oil will rise through it to the top of the liquid. Submerged in this liquid are
one or more filtering mediums, through which the oil must pass as it rises to the top
of the liquid. These mediums are entirely submerged in the liquid, and the oil passes
through them simultaneously with its passing through the liquid, so that the oil is
being acted upon by the liquid all of the time that it is passing through the filtering
medium. The action of the liquid upon the oil causes it to become thin, and as the
liquid extends above the filtering mediums the oil will remain thin until after it has
passed through all of the filtering mediums. This thinning of the oil by the action
of the liquid upon it has two important results:
First, the specific gravity of the oil becomes less and its drop or globular form is
broken up, and in passing through the filtering material all foreign substances will be
arrested and held by the filtering material. Substances which were held in suspension
by the thick oil will now be readily separated from it.
Second, the thin oil will more readily and evenly pass through the filtering mediums,
and as it does not pass out of the liquid until after it has passed through these mediums
it must consequently remain thin until it has passed through the filters. In other
words, it passes through the filters while being simultaneously acted upon by the
liquid.
In the accompanying drawings, 3 represents a suitable casing, which is filled to any
desired height with water or other liquid with which oil will not mix, and which is of
greater specific gravity than the oil. In this casing I arrange a filter-box 5, preferably
filled with wool and sawdust or other suitable filtering material. I may also use in
addition another filtering medium 7, arranged over the filter-box, but all submerged in
the liquid.
A pipe 9 is provided, through which the oil is conducted beneath the filters, and a
pipe 11, by which the purified oil may be withdrawn. As the filtering mediums are
entirely submerged in the liquid, the tendency to gum or clog up the filtering material
by the oil is removed. Filter-cloths or any filtering material that is exposed to the
atmosphere and is used for filtering oil will soon become so gummy that the oil will
not pass through it, and even where the filtering mediums are submerged in the oil
they will soon become clogged up, and even where it is intended that the filtering
mediums shall remain covered with oil they will often become exposed to the atino-
sphere, owing to the supply of oil running short. With this process, however, as the
filtering material is always fully submerged in the liquid, it is kept entirely free
from this difficulty. When the filtering medium becomes clogged with the dirt or
sediment removed from the oil, it may be readily removed and changed, but will

page_text: not become gummy from the passage of the oil through it, and will only need to be
removed when it has become filled up by the dirt removed from the oil.
I am aware that prior to this invention oil has been filtered by being passed first
through a liquid of greater specific gravity than the oil, and then passing it through
a filtering medium arranged above the liquid; but in this instance the action of the
liquid upon the oil ceases before it passes through the filtering medium, and the
fitering medium is exposed to the atmosphere, while in this process this action
continues until after the oil has passed through the filtering mediums, and the mediums
are not exposed.
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed, we declare that what we
claim is :-
The process of filtering oil, consisting in first passing the oil through a body of
liquid of greater specific gravity than the oil, and then passing it through porous
filtering media entirely submerged in such liquid, substantially as set forth.
Dated thie 22nd day of Avast 1800
J. P. BAYLY,
18, Fulham Place, W., Agent for the Applicants.
J. P. BAYLY,
18, Fulham Place, W., Agent for the Applicants.