US741228A - Antifouling coating. - Google Patents

Description

NITED STATES Patented October 13,1903.

PATENT GEORGE D. COLEMAN, OF BOSTON, MASSACHUSETTS, ASSIGNOR, BY MESNE ASSIGNMENTS, TO COLEMAN SHIP COPPERING COMPANY, A CORPORA- .TION OF MAINE.

ANTIFOULING COATING.

SPECIFICATION forming part of Letters Patent No. 741,228, dated October 13, 1903.

Serial No. 92,065. (No specimens.)

To all whom, it may concern:

Be it known that I, GEORGE D. COLEMAN, a citizen of the United States, residing at Boston, in the county of Suffolk and State of Has- 5 sachusetts, have invented certain new and useful Improvements in Antifouling Ooatings and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled to in the art to which it appertains to make and use the same.

The present invention relates to an improved antifouling coating for ships bottoms or structures submerged in or exposed to the :5 action of water, and particularly sea-water.

The object of my invention is to improve antifouling coatings for the above-described class of structures, and particularly to produce a coating for the bottoms of wooden z vessels which shall have strong adhesive qualities, resistance to wear, and deterioration from barnacles, toredoes, or marine animal. life which attach themselves to ships bottoms unless they areiso protected.

2 To the above end the present invention consists in the antifouling coating hereinafter described and claimed.

My antifouling coating consists of a layer of quick-drying paint, which is applied to the surface to be covered, in which is embedded particles of finely-divided metallic copper, preferably such as would be obtained by sifting with an eighty-mesh sieve, which are projected upon the moist surface of the paint 3 5 previously applied, preferably by means of a blower, and then rubbed or hammered into it to embed them in and to envelop them i by the paint and to bring the paint to the surface around the particles of copper. Then 0 still more finelydivided metallic copper, such preferably as would be obtained by sifting with a one-hundred-and-twe11ty-mesh sieve, are proj ected, preferably by means of a blower, against the paint brought to the surface by the previous rubbing, and finally by rubbing, or burnishing, or hammering the particles of the last layer of copper into the intersticesbetween the larger particles of copper of the first layer, thereby taking up the paint which flllS these interstices and presenting to the surface a go layer of particles of copper in which the particles are so close together and so efficiently cover the same that when polished it has the appearance of a continuous sheet of copper.

I prefer to employ and in its most perfect embodiment my invention requires the employment of a paint or cement which consists of-a mixture of cement or paint substance consisting of red lead or litharge and linseed-oil mixed together to the consistency of putty and baked at a lowtemperature and then pulverized and mixed with varnish, preferably made of forty gallons of linseedoil to one hundred pounds of Zanzibar or kauri' gums. This paint has the peculiar properties of having in itself all the ingredients neces- Sary to secure its rapid drying, and it is dense, tough, highly adhesive, and efficient in withstanding the action of water, as it is impervious to moisture. So while in its broader 7o aspects my invention is not limited to any particular form of paint, in its narrower aspects it is limited to the employment of this paint.

My invention contemplates any convenient 7 5 method of applying this coatingsuch, for example, as the method above described, which forms the subject-matter of another application executed by me of even date herewith.

Although the term red lead has been used in the claims, it is to be understood that the invention is not limited thereto, since other equivalent substances, such as litharge, may be substituted therefor without departure from the invention.

Having thus described my invention, I claim as new and desire to secure by Letters Patent of the United States 1. The antifouling coating for ships hot 0 toms or structures submerged in or exposed to the action of water, and particularly seawater, which consists of a layer of quickdrying paint, a layer of particles of finelydivided metallic copper embedded in and enveloped by the paint and a layer of still more finely divided metallic copper which is pressed into the paint in the interstices between the stance, made of linseed-oil and red lead baked larger particles of copperand presents a substantially continuous surface of bare particles of copper, substantially as described.

2. The antifouling coating for ships bottoms or structures submerged in or exposed to'the action of Water, and particularly seawater, which consists of a layer of paint, formed ofa mixture of cement or paint subat a low temperature, with varnish, a layer of finely-divided metallic copper embedded in and enveloped by the paint and a layer of HORACE VAN EVEREN,

I Witnesses:

BENJAMIN PHILLIPS.