Bad Conductor of Heat.
Year: 1888

page_text: HARTMANN, of
[Communicated from abroad by THE FIRM OF GRÜNZWEIG AND
Ludwigshafen, in the German Empire, Manufacturers.]
Bad Conductor of Heat.
I, OLIVER IMRAY of No. 28 Southampton Buildings Chancery Lane in the County
of Middlesex Fellow of the Institute of Patent Agents do hereby declare the nature of
this invention to be as follows:-
According to this invention cork reduced to small fragments is coated on the
surface with a very thin layer of waterproof compound consisting of a mixture of
resius and artificial or natural asphalt, the proportions of which may vary, or which
may also be used separately, such coating of the cork being effected in any suitable
heated mixing apparatus.
By this means are obtained granules with lustrous coating adhering slightly
together, the specific gravity of which in the loose condition is 0.14 or less. These
granules are introduced hot into a previously heated mould, coated internally with
graphite, in which they are compressed into a uniformly compact mass the specific
gravity of which is 0.5 or less.
In place of cork may be used peat, bark, pith, wood, or paper, but the product with
these will be of less value than with cork.
Dated this 30th day of May 1888.
ABEL & IMRAY,
Agents for the Applicant.

page_text: COMPLETE SPECIFICATION.
Improved Waterproof Compound Containing Cork or an Equivalent
Bad Conductor of Heat.
I, OLIVER IMRAY of No. 28 Southampton Buildings Chancery Lane in the County
of Middlesex Fellow of the Institute of Patent Agents 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:-
According to this invention cork reduced to small fragments is coated on the
surface with a very thin layer of waterproof compound consisting of a mixture of
resins and artificial or natural asphalt, the proportions of which may vary, or which
may also be used separately, such coating of the cork being effected in any suitable
heated mixing apparatus.
By this means are obtained granules with lustrous coating adhering slightly
together, the specific gravity of which in the loose condition is 0.14 or less. These
granules are introduced hot into a previously heated mould, coated internally with
graphite, in which they are compressed into a uniformly compact mass the specific
gravity of which is 0.5 or less.
In place of cork may be used peat, bark, pith, wood-or-paper, but the product with
these will be of less value than with cork.
In the manufacture of this compound it is of advantage to use the following propor-
tions of ingredients: The mixture of resin an asphaltum contains about 2" parts of
resin and 3 parts of asphaltum. Of this mixture one part in bulk is mixed with about
7 parts in bulk of cork.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what 1
claim is :-
1. As an improved article of manufacture, a granular waterproof and non-heat-con-
ducting compound consisting of ground cork the granules of which are provided with
a thin external coating of resin and asphalt, substantially as set forth.
2. As an improved article of manufacture, a compressed waterproof and non beat
conducting block or body formed of granules of cork coated thinly externally with
resin and asphalt, substantially as set forth.
DL:
1
1000