An Improved Preservative and Water-proof Coating for Metals, Timber, Masonry, Concrete, or other Structures or Surfaces.
Year: 1889

page_text: Date of Application, 15th Nov., 1889-Accepted, 19th Apr., 1890
GOMDI TA
An Improved Preservative and Water-proof Coating for Metals,
Timber, Masonry, Concrete, or other Structures or Surfaces.
I THEODORE PRIDHAM of Petersham near Sydney in the Colony of New South
Wales, Civil Engineer 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 an improved preservative coating suitable for covering
metals timber masonry concrete brickwork ships tanks pipes structures of wood or
metal or other structures or surfaces, exposed to the action of water the sea and
ordinary weather which preservative coating may be used for covering structures of
all descriptions for waterproofing purposes. This invention is especially useful for
preserving iron steel and woodwork structures and the like from oxidation and decay
and of rendering waterproof roofing masonry brickwork concrete and other structures
or surfaces, and by it the necessity and cost of applying paint and such like at
frequent intervals is entirely obviated. This improved preservative and waterproof
coating when once applied is considerably more effective and durable than paint and
is dry or practically dry upon application.
This said improved preservative and waterproof coating consists essentially of a
mixture of mineral bitumen and oil preferably mineral oil or oily matters (and with
or without other materials) rolled or pressed into sheets preferably very thin sheets of
a pliable and ductile character and fixed upon the article to be covered by being
pressed upon an adhesivo solution between it and the said article.
In practice I take refined mineral bitumen pure and of the best quality and mix in
it while hot a sufficient quantity (such quantity being regulated by tests of the
mixture and depending upon the temperature of the locality in which it is prepared
and to be used) of mineral oil so that upon cooling the now plastic mass may be
rolled out into strips or sheets of any suitable size and thickness but preferably less
than one sixteenth of an inch thick. The inner surface of the sheet to be applied or
the surface to be covered or both is or are first painted or coated with mineral oil or a
solution of bitumen and mineral oil or other adhesive solution and the prepared
coating in the form of sheets is pressed by direct pressure or by a roller upon the
surfaces to which it is to be applied with butt or lap joints as preferred and will form
a substantial coating of which the external surface will be smooth and dry or
practically dry.
The quantity of kerosene to be used will depend on the temperature and dryness of
the atmosphere the duration of boiling and the purpose for which the coating is
required but when the outside temperature of the atmosphere is say 50° an example
of mixture suitable to produce a material to answer average conditions would be one
to two parts of kerosene to forty parts of bitumen.
1 would have it understood that although I have pointed out the best method I
know of for preparing the thin sheets of the preservative and waterproof coating yet
many other substances might be added to the composition to be rolled out with more
or less beneficial results according to the purpose for which the material is to be
used and I would further bave it understood that I do not confine myself to any
particular composition so long as the nature of my composition be retained that is
that mineral bitumen and oil or oily materials be used to form the essential part of
the coating material.

page_text: Having now particularly described and explained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :
First. An improved preservative and waterproof coating for metals timber masonry
concrete or other surfaces or structures consisting of sheets of a mixture in which
mineral bitumen and oil or oily materials are ingredients (whether with or without
other ingredients) applied to the article to be covered above or on a thin coating of
oil or adhesive solution substantially as herein described and explained.
Second. As a new article of manufacture sheets of a pressed or rolled mixture of
or containing mineral bitumen and oil or oily materials substantially as herein described
and explained.
Dated this Fourth day of October One thousand eight hundred and eighty-nine.
T. PRIDHAM.