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Process for preparing urea
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Patent number 6,111,138
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Issue date Aug 29, 2000
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DSM N.V.
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Julius G. T. Van Wijck
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C07 - ORGANIC CHEMISTRY
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3708536
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Patent number 3,708,536
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Issue date Jan 2, 1973
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C07 - ORGANIC CHEMISTRY
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3697521
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Patent number 3,697,521
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Issue date Oct 10, 1972
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C07 - ORGANIC CHEMISTRY
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3503970
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Patent number 3,503,970
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Issue date Mar 31, 1970
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C07 - ORGANIC CHEMISTRY
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3239522
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Patent number 3,239,522
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Issue date Mar 8, 1966
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C07 - ORGANIC CHEMISTRY
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2950173
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Patent number 2,950,173
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Issue date Aug 23, 1960
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C07 - ORGANIC CHEMISTRY