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Color Curly Brackets (indicating CPC extensions to IPC) References Date Revised
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CPC
COOPERATIVE PATENT CLASSIFICATION
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PHOSPHATIC FERTILISERS [2013‑01]
WARNING
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IPC group C05B21/00 is not used in the CPC scheme. Subject matter covered by this group is classified in one of the CPC groups C05B 1/00 to C05B 19/00 (see internal note after the title of class C05)

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Superphosphates, i.e. fertilisers produced by reacting rock or bone phosphates with sulfuric or phosphoric acid in such amounts and concentrations as to yield solid products directly [2013‑01]
C05B 1/02
.
Superphosphates [2013‑01]
C05B 1/04
.
Double-superphosphate; Triple-superphosphate; Other fertilisers based essentially on monocalcium phosphate [2013‑01]
C05B 1/06
.
Ammoniation of superphosphates (fertilisers based essentially on ammonium orthophosphate C05B 7/00) [2013‑01]
C05B 1/10
.
Apparatus for the manufacture of superphosphates [2013‑01]
Fertilisers based essentially on di-calcium phosphate (C05B 11/00 takes precedence) [2013‑01]
Thomas phosphate; Other slag phosphates [2013‑01]
Fertilisers based essentially on alkali or ammonium orthophosphates (C05B 11/00 takes precedence) [2013‑01]
Fertilisers based essentially on phosphates or double phosphates of magnesium (C05B 11/00 takes precedence) [2013‑01]
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C05B 11/00
Fertilisers produced by wet-treating or leaching raw materials either with acids in such amounts and concentrations as to yield solutions followed by neutralisation, or with alkaline lyes [2013‑01]
C05B 11/02
.
Pretreatment [2013‑01]
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C05B 11/04
.
using mineral acid [2013‑01]
C05B 11/06
. .
using nitric acid (nitrophosphates) [2013‑01]
C05B 11/08
. .
using sulfuric acid [2013‑01]
C05B 11/10
. .
using orthophosphoric acid [2013‑01]
C05B 11/12
. .
using aqueous hydrochloric acid [2013‑01]
C05B 11/14
. .
using wet gaseous acids [2013‑01]
C05B 11/16
.
using alkaline lyes [2013‑01]
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Fertilisers produced by pyrogenic processes from phosphatic materials [2013‑01]
C05B 13/02
.
from rock phosphates (C05B 13/06 takes precedence) [2013‑01]
C05B 13/04
.
from metallic phosphorus compounds, e.g. ferro-phosphorus [2013‑01]
C05B 13/06
.
Alkali and alkaline earth meta- or polyphosphate fertilisers [2013‑01]
Organic phosphatic fertilisers (bone meal C05B 17/00) [2013‑01]
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Other phosphatic fertilisers, e.g. soft rock phosphates, bone meal [2013‑01]
C05B 17/02
.
containing manganese [2013‑01]
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Granulation or pelletisation of phosphatic fertilisers, other than slag (granulating apparatus B01J 2/00; granulating slag C04B) [2013‑01]
C05B 19/02
.
of superphosphates or mixtures containing them [2013‑01]
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Last Modified: 10/10/2013