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i061 UUMI’USHIUND,
EXAM]
_
COAUNG GR PLASTIC
98
2,407,739
Patented Sept. 17, 1946
UNITED STATES PATENT. OFFICE
2,407,739
PLASTIC CEMENTITIOUS MATERIAL
Gaspare Ferrante, Brooklyn, N. Y., assignor to
Grasoph Building Corp., Brooklyn, N. Y., a cor-V
poration of New York
No Drawing. Application December 2, 1943,
Serial No. 512,599
1 Claim. (Cl. 106-98)
1
2
This invention relates to new and useful im
provements in a plastic cementitious material,
and has more particular reference to so-called in
terior wall plaster.
Still further the invention proposes an im
proved plaster and plaster board which may be
manufactured and sold-at a reasonable cost/and
which contains nothing of an injurious or dele
_
It is an object of this invention to produce a
terious nature.
wall plaster (interior) which is far superior than
present day similar plaster.~
'
For further comprehension of this invention,
and of the objects and advantages thereof, ref
erence will be had to the following description,
The invention contemplates the use of brick
dust incorporated within the plaster to obtain
and to the appended claims in which the vari
mu advantages. Bricks hay-beeen proven to 10 ous'novel features of the invention are more
be an excellent material for outside walls. Brick
particularly set forth.
dust embodies many of the advantageous fea
In order to enable others to better understand
tures of brick material, yet, as far as I know. it
this invention speci?c formulas will now be given
has never been used for interior wall construc
for a plaster and plaster board embodying the
tions.
15 essential features thereof.
To better understand the invention it must
Example I
be recognized that Portland cement,- and other
Formula
for
an
interior
wall plans-tier.
cementitious substances are no rac ical as bases
for interior plaster because of their lack of plas
c y, or sprea n qualities under the mechan
ic’s tool, as well as the lack of adhesion. How.
ever, such materials have been made adaptable,
for these uses by the addition of
1
in
'20
lime
(hydrated lime) used in various proportions as
e plaster ingredients are being mixed.
It is general practice to use a plaster base mix
ture with ?nishing lime, sand, and siniilar ma
lbs-.. 100 (71%%)
Finishing lime (hydrated lime)
lbs__ 10 (OW/6%)
Brick dust ________________ "lbs..-
20 (14%%)
Sand and marble dust ______ _..lbs_..
10 (07%.)
Water __-_-., _____________ _..gals__
10-15
The brick dust which I have used with good
results was obtained from the nearby New Jersey
terlals in th'é'c‘oiis'?’iictiodof’ interior wall plas-.
.
Cementnplaster base (interior)
brick factories. This brick dust I call “Jerseyu
brick dust." The ingredients are mixed to'g'éth‘ér
e m1 way used for the making of plaster.
ered that this plaster material may be used to
It will be found that the plaster has good spread
construct plaster board as well. The improved
ing and adhesive qualities.
interior plaster and plaster board have especially
good ?reproof and waterproof qualities-they are
Example II
sturdy and strong; they have low heat conduc 35
The following formulae may be used for rock"
tivity and act as good heat insulation material.
The improved plaster and plaster board does not
slitlllaltuni?temqar?st
'
readily crack, crumble nor break under ordinary
Finishing lime (hydrated lime)
conditions of service. It is particularly well
lbs..- 60 (30%)
adapted to receive coats of paint and covering 40 Cement plaster base _______ “lbs-..
100
(50 %)
materials.
Sawdust ________________ .._lbs__ 25 (12 1/¢ %)
Thave discovered by using brick dust, a
far superior plaster is obtained. . have
scov
I am aware of the fact that brick dust has been
used in connection with concrete to construct ar
ti?cial bricks. I am also aware that brick dust
has been used as a coloring material for plastic
materials from which various articles are molded.
30
Brick dust _______________ __lbs__
Water __________________ .. -gals__
15
(7%%)
5-10
The plaster boards are made by mixing the
materials and working them in the usual ways.
However, the advantages gained by using brick
While I have described the preferred embodi
dust in an interior plaster or plaster board has
ments' of my invention, it is to be understood that
never been discovered before.
I do not limit myself -to the precise formulas
It is another object of this invention to use 50 herein disclosed, and the right is reserved to all
the largest percentage possible of brick dust in a
changes .and modi?cations coming within the
scope of the invention as de?ned in the append
plaster or plaster board, commensurate with the
production of a good interior plaster and plaster
ed claim.
board.
Having thus described my invention, what I
I believe that an interior plaster is generally 55 claim as new and desire to secure by United
States Letters Patent is:
characterized by théYse‘TSI’LYiYdi‘aWt’edQIime, and
the dominating feature of my invention is the
An interior wall plaster, consisting of a mix
use ofwbrick dust with such plaster.
ture of a Portland cement base, 100 lbs.; hydrated
The improved plaster, in accordance with this
lime, 10 lbs.; brick dust, 20 lbs.; sand and marble
invention, may be used for all purposes for which 60 dust, 10 lbs.; and water, 10 to 15 gals.
interior plasters are now being used.
GASPARE FERRANTE.
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