Algae-resistant roofing material and methods

Details Algae-resistant roofing material and methods Algae-resistant roofing material and methods

2008-01-29

2008-01-29

Lam, Cathy (Department: 1775)

Stock material or miscellaneous articles

Structurally defined web or sheet

Continuous and nonuniform or irregular surface on layer or...

C428S144000, C428S148000, C428S150000

Reexamination Certificate

active

11378335

ABSTRACT:
A method of making algae-resistant shingles in which the algae-inhibiting material, usually a copper compound, is applied only to larger granules, instead of being applied to a full size range of granules. Use of the larger granules only, as algae-resistant granules, significantly increases the percentage of surface area of algae-resistant granules for releasing algae-inhibiting material and also reduces the material consumption of the algae-inhibiting material during production of the algae-resistant granules, thus substantially reducing cost.

REFERENCES:
patent: 3888683 (1975-06-01), Horai et al.
patent: 5186980 (1993-02-01), Koschitzky
patent: 5356664 (1994-10-01), Narayan et al.
patent: 5573810 (1996-11-01), Grubka

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