Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
306 words
ALGICIDAL ROOFING GRANULES HAVING AN ENHANCED ABILITY, OVER AN EXTENDED PERIOD OF TIME, TO LEACH ALGICIDAL IONS TO PREVENT OR INHIBIT THE GROWTH OF DISCOLORING ALGAE AND FUNGI ORGANISMS UPON ATMOSPHERIC EXPOSURE OF ROOFING SURFACES CONTAINING SICH GRANULES, COMPRISING A. BASE MINERAL GRANULES; B. AN INNER, MOISTURE PERMEABLE, DURABLE, WATER INSOLUBILIZED, PIGMENTED, FIRED, IORGANIC ALKALI METAL SILICATECLAY COATING, SAID COATING CONTAINING A MIXTURE OF ZINC AND COPPER ALGICIDES; AND C. AN OUTER, MOISTURE PERMEABLE, DURABLE, WATER INSOLUBILIZED, PIGMENTED, FIRED, INORGANIC ALKALI METAL SILICATECLAY COATING, SAID COATING CONTAINING A MIXTURE OF ZINC AND COPPER ALGICIDES, THE TOTAL ZINC ALGICICAL CONTENT OF SAID INNER AND OUTER COATINGS BEING IN THE RANGE OF FROM ABOUT 0.05 TO ABOUT 0.5 PERCENT BY WEIGHT BASED ON THE TOTAL WEIGHT OF SAID BASE GRANULES, THE TOTAL COPPER ALGICIDAL CONTENT OF SAID INNER AND OUTER COATINGS BEING IN THE RANGE OF FROM ABOUT 0.05 TO ABOUT 0.5 PERCENT BY WEIGHT BASED ON THE TOTAL WEIGHT OF SAID BASE GRANULES AND THE TOTAL ALGICIDAL CONTENT OF SAID OUTER COATING BEING LESS THAN THAT OF SAID INNER COATING, WHEREBY WHEN SAID COATED GRANULES ARE INCORPORATED INTO ROOFING COMPOSITIONS AND EXPOSED TO ATMOSPHERIC WEATHERING AGICIDAL IONS ARE SLOWLY LEACHED FROM THE OUTER COATING DURING PERIODS OF RAIN AND DEW TO RETARD THE GROWTH OF ALGAE AND FUNGI, SAID INNER COATING SERVING AS A RESERVOIR OF ALGICIDAL IONS, THUS ASSURING THE CONTINUED LEACHING OF ALGICIDAL IONS FROM SAID GRANULES DURING USE OVER AN EXTENDED PERIOD OF TIME AND ASSURING THE EFFECTIVE UNTILZATION OF THE ALGICIDAL CONTENT OF THE OVERALL GRANULE COATING, SAID INNER COATING ALSO TENDING TO FILL IN VOIDS IN THE BASE MINERAL GRANULES SO AS TO ASSURE A MORE UNIFORM OUTER COATING, ENHANCING THE UNIFORMITY OF THE RESISTANCE OF ROOFING SURFACES CONTAINING SAID GRANULES TO DISCOLORATION DURING SUCH EXTENDED PERIODS OF EXPOSURE TO ATMOSPHERIC WEATHERING.
Claim 2
Dependent Claim
306 words
ALGICIDAL ROOFING GRANULES HAVING AN ENHANCED ABILITY, OVER AN EXTENDED PERIOD OF TIME, TO LEACH ALGICIDAL IONS TO PREVENT OR INHIBIT THE GROWTH OF DISCOLORING ALGAE AND FUNGI ORGANISMS UPON ATMOSPHERIC EXPOSURE OF ROOFING SURFACES CONTAINING SICH GRANULES, COMPRISING A. BASE MINERAL GRANULES; B. AN INNER, MOISTURE PERMEABLE, DURABLE, WATER INSOLUBILIZED, PIGMENTED, FIRED, IORGANIC ALKALI METAL SILICATECLAY COATING, SAID COATING CONTAINING A MIXTURE OF ZINC AND COPPER ALGICIDES; AND C. AN OUTER, MOISTURE PERMEABLE, DURABLE, WATER INSOLUBILIZED, PIGMENTED, FIRED, INORGANIC ALKALI METAL SILICATECLAY COATING, SAID COATING CONTAINING A MIXTURE OF ZINC AND COPPER ALGICIDES, THE TOTAL ZINC ALGICICAL CONTENT OF SAID INNER AND OUTER COATINGS BEING IN THE RANGE OF FROM ABOUT 0.05 TO ABOUT 0.5 PERCENT BY WEIGHT BASED ON THE TOTAL WEIGHT OF SAID BASE GRANULES, THE TOTAL COPPER ALGICIDAL CONTENT OF SAID INNER AND OUTER COATINGS BEING IN THE RANGE OF FROM ABOUT 0.05 TO ABOUT 0.5 PERCENT BY WEIGHT BASED ON THE TOTAL WEIGHT OF SAID BASE GRANULES AND THE TOTAL ALGICIDAL CONTENT OF SAID OUTER COATING BEING LESS THAN THAT OF SAID INNER COATING, WHEREBY WHEN SAID COATED GRANULES ARE INCORPORATED INTO ROOFING COMPOSITIONS AND EXPOSED TO ATMOSPHERIC WEATHERING AGICIDAL IONS ARE SLOWLY LEACHED FROM THE OUTER COATING DURING PERIODS OF RAIN AND DEW TO RETARD THE GROWTH OF ALGAE AND FUNGI, SAID INNER COATING SERVING AS A RESERVOIR OF ALGICIDAL IONS, THUS ASSURING THE CONTINUED LEACHING OF ALGICIDAL IONS FROM SAID GRANULES DURING USE OVER AN EXTENDED PERIOD OF TIME AND ASSURING THE EFFECTIVE UNTILZATION OF THE ALGICIDAL CONTENT OF THE OVERALL GRANULE COATING, SAID INNER COATING ALSO TENDING TO FILL IN VOIDS IN THE BASE MINERAL GRANULES SO AS TO ASSURE A MORE UNIFORM OUTER COATING, ENHANCING THE UNIFORMITY OF THE RESISTANCE OF ROOFING SURFACES CONTAINING SAID GRANULES TO DISCOLORATION DURING SUCH EXTENDED PERIODS OF EXPOSURE TO ATMOSPHERIC WEATHERING.
Claim 3
Dependent Claim
28 words
The algicidal roofing granules of claim 1 in which the algicidal content of said inner coating is at least about twice the algicidal content of said outer coating.
Claim 4
Dependent Claim
54 words
The algicidal roofing granules of claim 2 in which said zinc algicide is present in said inner coating in an amount at least about twice the zinc algicide content of said outer coating, said copper algicide being present in said inner coating in an amount in excess of that employed in said outer coating.
Claim 5
Dependent Claim
14 words
The algicidal roofing granules of claim 3 in which said zinc algicide comprises ZnO.
Claim 6
Dependent Claim
14 words
The algicidal roofing granules of claim 4 in which said copper algicide comprises Cu2O.
Claim 7
Dependent Claim
20 words
The algicidal roofing granules of claim 4 in which said copper algicide comprises a mixture of cuprous and cupric algicides.
Claim 8
Dependent Claim
21 words
The algicidal roofing granules of claim 6 in which said cuprous algicide comprises Cu2O and said cupric oxide comprises copper sulfate.
Claim 9
Dependent Claim
39 words
The algicidal roofing granules of claim 7 in which said copper algicide in said outer coating consists essentially of copper sulfate and said copper algicide in said inner coating consists essentially of a mixture of copper sulfate and Cu2O.
Claim 10
Dependent Claim
61 words
The algicidal roofing granules of claim 8 in which said outer coating cOntains about 2 lbs. of copper sulfate and about 1 lb. of ZnO per ton of base mineral granules, and in which said inner coating contains about 2 lbs. of Cu2O, about 2 lbs. of copper sulfate and about 3 lbs. of ZnO per ton of said base granules.
Claim 11
Dependent Claim
48 words
The algicidal roofing granules of claim 5 in which said outer coating contains about 1 lb. of ZnO per ton of base mineral granules, and in which said inner coating contains about 5 lbs. of Cu2O and about 3 lbs. of ZnO per ton of said base granules.