Urea-hydrogen peroxide-polyvinylpyrrolidone process
Patent 5206385 Issued on April 27, 1993. Estimated Expiration Date: 
July 2, 2012. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
July 2, 2012. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesN-phenyl-maleimides and N-phenyl-succinimides and their use in a herbicidal and/or plant growth regulating action Anhydrous complexes of PVP and hydrogen peroxide Patent #: 5008093 InventorsAssigneeApplicationNo. 908107 filed on 07/02/1992US Classes:548/543, Chalcogen bonded directly to a ring carbon of the five-membered hetero ring which is adjacent to the ring nitrogen (e.g., 2-pyrrolidones, etc.)252/186.29, With organic material423/265, WITH ADDITIVE423/272, For hydrogen peroxide524/438Nonmetal compound DNRMExaminersPrimary: Springer, David B.Attorney, Agent or FirmInternational ClassesC07D 403/14C01B 015/01 AbstractUrea-hydrogen peroxide-polyvinylpyrrolidone (PVP) in the form of a free-flowing powder is stable against decomposition in water and alcohol solvents. The product is obtained by spraying an aqueous solution of urea-hydrogen peroxide onto a fluidized bed of PVP and drying; it contains about 5%-20% by weight H2 O2 and less than about 5% water. The urea-hydrogen peroxide solution is applied onto the fluidized PVP bed at a predetermined rate, suitably about 0.5-30 g of solution/minute/kg PVP in the bed, and, preferably, about 1-3 g/min/kg PVP. |
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