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Class Information
Number: 71/40
Name: Chemistry: fertilizers > Processes and products > Inorganic material > Phosphorus-containing > Phosphates > Acid treatment > Sulfuric acid
Description: Processes wherein the acid used in H2SO4.

Patents under this class:

Patent Number Title Of Patent Date Issued
8557013 Bioorganically-augmented high value fertilizer Oct. 15, 2013
8123116 Fuel dispenser with intelligent switch Feb. 28, 2012
7947104 Process for treating sludge and manufacturing bioorganically-augmented high nitrogen-containing inorganic fertilizer May. 24, 2011
7534281 Organic recycling with a pipe-cross or tubular reactor May. 19, 2009
7452398 Phosphate and potash(PK)-containing compound fertilizer Nov. 18, 2008
6346131 Fertilizer compositions for administering phosphates to plants Feb. 12, 2002
6231767 Treatment of phosphatic wastes May. 15, 2001
5308372 Vegetable oil processing to obtain nutrient by-products May. 3, 1994
5275639 Recovery of phosphates from elemental phosphorus bearing wastes Jan. 4, 1994
5211735 Process for preparing phosphated or nitrophosphated fertilizers through solubilization of phosphate rock May. 18, 1993
4939165 Photoactive bithienyl pesticides Jul. 3, 1990
4836843 Fertilizer process Jun. 6, 1989
4834787 Phosphate rock utilization May. 30, 1989
4710364 Continuous recovery of sulfur oxide from flue gas Dec. 1, 1987
4650682 Acidifier-ammoniator Mar. 17, 1987
4594090 High nutrient content fertilizers Jun. 10, 1986
4568374 Process for the preparation of fertilizers by the partial solubilization of phosphate rocks Feb. 4, 1986
4522638 Method and apparatus for regulating the NH.sub.3 content in scrubbing liquid used in a gas scrubbing process Jun. 11, 1985
4469504 Process for the partial solubilization of phosphate rock and obtaining acid and phosphate fertilizers therefrom Sep. 4, 1984
4462972 Method for producing fertilizer-grade phosphoric acid Jul. 31, 1984
4397675 Method of producing urea-sulfuric acid reaction products Aug. 9, 1983
4388101 Non-pressure nitrogen carrier fertilizer solutions and dispersions and process of manufacture Jun. 14, 1983
4336053 Fertilizer solutions stabilized with inorganic acids Jun. 22, 1982
T101901 Ammonium polyphosphate sulfate fertilizers from wet-process phosphoric acid Jun. 1, 1982
4321077 Method of preparation of multicomponent fertilizers Mar. 23, 1982
4308049 Process for the absorption of ammonia in acid solutions or slurries Dec. 29, 1981
4252553 Process for production of fertilizers Feb. 24, 1981
4231780 Treatment of phosphate rock on soil in situ with sulfuric acid Nov. 4, 1980
4177053 Method for the production of phosphoric acid with high contents of fertilizer-nutrients Dec. 4, 1979
4175944 Removal of fluorine during production of fertilizer Nov. 27, 1979
4168150 Process for production of fertilizers Sep. 18, 1979
4077794 Method for the manufacture of soil modifiers from waste materials of the manufacture of titanium dioxide Mar. 7, 1978
4073635 Process for producing a slurry suitable for the manufacture of a mixed fertilizer containing nitrogen plus phosphorus Feb. 14, 1978
4073634 Process for production of fertilizers Feb. 14, 1978
RE29458 Potassium phosphate manufacture Oct. 25, 1977
4045205 Method for the manufacture of soil modifiers from waste material of the manufacture of titanium dioxide Aug. 30, 1977
4028087 Fertilizer processes incorporating scrubbed flue gas sludge byproduct Jun. 7, 1977
RE29149 Production of ammonium phosphates and product thereof Mar. 8, 1977
4007030 Process for the simultaneous manufacture of phosphoric acid or the salts thereof and a complex multi-component mineral fertilizer Feb. 8, 1977
3979199 Treatment of phosphate rock in soil to provide fertilizer and gypsum Sep. 7, 1976
3962329 Manufacture of granular isobutylidenediurea Jun. 8, 1976
3947262 Method of producing phosphorus-containing fertilizers Mar. 30, 1976

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