Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – Shaping against forming surface
Reexamination Certificate
2006-10-10
2006-10-10
Ahmad, Nasser (Department: 1772)
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
Shaping against forming surface
C220S062220, C220S560000, C220S565000, C220S567000, C264S311000, C264S312000
Reexamination Certificate
active
07118700
ABSTRACT:
A method of inhibiting the growth of algae and like organisms in plastic water tanks exposed to sunlight comprises providing an outer tank surface operative to reflect off a substantial portion of sunlight that hits the tank off the outer tank surface; and providing an opaque inner tank layer operative to substantially prevent sunlight passing through the outer tank surface from entering an interior of the tank. A two layer tank is provided comprising a light colored outer layer and a dark sun-blocking inner layer, and is conveniently made by a rotational molding process.
REFERENCES:
patent: 3735895 (1973-05-01), Roper
patent: 5547096 (1996-08-01), Kleyn
patent: 1199884 (1989-08-01), None
Ahmad Nasser
Bourgault Industries Ltd.
Frost Brown Todd LLC
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