Coating processes – Solid particles or fibers applied – Roofing produced
Reexamination Certificate
2006-10-24
2006-10-24
Parker, Fred J. (Department: 1762)
Coating processes
Solid particles or fibers applied
Roofing produced
C427S188000
Reexamination Certificate
active
07125579
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: 4092441 (1978-05-01), Meyer et al.
patent: 5356664 (1994-10-01), Narayan et al.
Bereskin & Parr
Parker Fred J.
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