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Bis-cyclic ureas
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Patent number 4,138,398
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Issue date Feb 6, 1979
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The Upjohn Company
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Reinhard H. Richter
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C07 - ORGANIC CHEMISTRY
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Polymethylene polyphenyl polyisocyanate
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Patent number 4,092,343
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Issue date May 30, 1978
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The Upjohn Company
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Floro F. Frulla
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C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
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Araliphatic diisocyanates
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Patent number 4,051,166
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Issue date Sep 27, 1977
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The Upjohn Company
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Reinhard H. Richter
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C07 - ORGANIC CHEMISTRY
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Process
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Patent number 4,010,209
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Issue date Mar 1, 1977
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The Upjohn Company
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Curtis P. Smith
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C07 - ORGANIC CHEMISTRY
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