C01B 17/20 Methods for preparing sulfides or polysulfides, in general (ammonium sulfides or polysulfides C01C; sulfides or polysulfides of metals, other than alkali metals, magnesium, calcium, strontium and barium, see the relevant groups of subclasses C01F or C01G, according to the metal)
Introduced: September 1968
Title
Titles differ between systems:
IPC: Methods for preparing sulfides or polysulfides, in general
CPC: Methods for preparing sulfides or polysulfides, in general (ammonium sulfides or polysulfides C01C; sulfides or polysulfides of metals, other than alkali metals, magnesium, calcium, strontium and barium, see the relevant groups of subclasses C01F or C01G, according to the metal)
Full Title
Full titles differ between systems:
Sulfur; Compounds thereof > Methods for preparing sulfides or polysulfides, in general
Sulfur; Compounds thereof > Methods for preparing sulfides or polysulfides, in general (ammonium sulfides or polysulfides C01C; sulfides or polysulfides of metals, other than alkali metals, magnesium, calcium, strontium and barium, see the relevant groups of subclasses C01F or C01G, according to the metal)
No child classifications to compare. This is a leaf node in both IPC and CPC.