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3567414
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Patent number 3,567,414
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Issue date Mar 2, 1971
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C03 - GLASS MINERAL OR SLAG WOOL
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3551304
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Patent number 3,551,304
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Issue date Dec 29, 1970
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C23 - COATING METALLIC MATERIAL COATING MATERIAL WITH METALLIC MATERIAL CHEMI...
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2636832
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Patent number 2,636,832
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Issue date Apr 28, 1953
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C03 - GLASS MINERAL OR SLAG WOOL
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2597562
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Patent number 2,597,562
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Issue date May 20, 1952
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C03 - GLASS MINERAL OR SLAG WOOL