Phosphorus compounds (9/02; 9/06) > Compound contains a ring which is devoid of a metal atom and contains at least one p atom as ring member (9/6564; 9/6564v; 9/6568; 9/6568b; 9/6568c; 9/6568d; 9/6568e; 9/6568f) > Ring contains o and p only, or may include in addition to the required o and p, only c (9/6571) > Contains p(o) group as atoms in the ring and wherein the p atom is directly bonded to n (9/6571b) > Patents

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Class Information
Number: 987/42
Name: Organic compounds containing a bi, sb, as, or p atom or containing a metal atom of the 6th to 8th group of the periodic system > Phosphorus compounds (9/02; 9/06) > Compound contains a ring which is devoid of a metal atom and contains at least one p atom as ring member (9/6564; 9/6564v; 9/6568; 9/6568b; 9/6568c; 9/6568d; 9/6568e; 9/6568f) > Ring contains o and p only, or may include in addition to the required o and p, only c (9/6571) > Contains p(o) group as atoms in the ring and wherein the p atom is directly bonded to n (9/6571b)
Description: Subject matter wherein the ring phosphorus atom is bonded directly to at least one oxygen atom in the ring and is also bonded to at least one nitrogen atom which may be in the ring or extracyclic to the ring.

Patents under this class:

Patent Number	Title Of Patent	Date Issued
4980275	Photographic material and process comprising a dye stabilizer	Dec. 25, 1990

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