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Preparation of phosphates
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Patent number 3,956,464
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Issue date May 11, 1976
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Pennzoil Company
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Erhart K. Drechsel
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C05 - FERTILISERS MANUFACTURE THEREOF
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3767770
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Patent number 3,767,770
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Issue date Oct 23, 1973
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C05 - FERTILISERS MANUFACTURE THEREOF
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3758612
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Patent number 3,758,612
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Issue date Sep 11, 1973
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C07 - ORGANIC CHEMISTRY
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3752879
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Patent number 3,752,879
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Issue date Aug 14, 1973
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C01 - INORGANIC CHEMISTRY
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3718453
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Patent number 3,718,453
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Issue date Feb 27, 1973
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C05 - FERTILISERS MANUFACTURE THEREOF
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3708275
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Patent number 3,708,275
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Issue date Jan 2, 1973
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C05 - FERTILISERS MANUFACTURE THEREOF
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3697246
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Patent number 3,697,246
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Issue date Oct 10, 1972
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C05 - FERTILISERS MANUFACTURE THEREOF
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3647369
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Patent number 3,647,369
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Issue date Mar 7, 1972
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C01 - INORGANIC CHEMISTRY
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3615184
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Patent number 3,615,184
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Issue date Oct 26, 1971
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C01 - INORGANIC CHEMISTRY
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3607021
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Patent number 3,607,021
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Issue date Sep 21, 1971
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C01 - INORGANIC CHEMISTRY